<?xml version="1.0" encoding="US-ASCII"?>
<!-- DFIN New ActiveDisclosure (SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date :2021-08-11T17:57:59.6915+00:00 -->
<!-- Copyright (c) 2021 Donnelly Financial Solutions, Inc. All Rights Reserved. -->
<xsd:schema targetNamespace="http://fadv.com/20210630" attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:srt="http://fasb.org/srt/2020-01-31" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:us-gaap="http://fasb.org/us-gaap/2020-01-31" xmlns:dei="http://xbrl.sec.gov/dei/2020-01-31" xmlns:fa="http://fadv.com/20210630" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:xlink="http://www.w3.org/1999/xlink">
  <xsd:import schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/instance"/>
  <xsd:import schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/linkbase"/>
  <xsd:import schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" namespace="http://xbrl.org/2005/xbrldt"/>
  <xsd:import schemaLocation="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd" namespace="http://fasb.org/us-gaap/2020-01-31"/>
  <xsd:import schemaLocation="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd" namespace="http://xbrl.sec.gov/dei/2020-01-31"/>
  <xsd:import schemaLocation="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd" namespace="http://fasb.org/srt/2020-01-31"/>
  <xsd:import schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" namespace="http://www.xbrl.org/dtr/type/numeric"/>
  <xsd:import schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" namespace="http://www.xbrl.org/dtr/type/non-numeric"/>
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="fa-20210630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:title="Labels link" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="fa-20210630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:title="Presentation link" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="fa-20210630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:title="Definition link" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="fa-20210630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:title="Calculation link" xlink:type="simple"/>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DocumentDocumentAndEntityInformation" id="Role_DocumentDocumentAndEntityInformation">
        <link:definition>100000 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_StatementCondensedConsolidatedBalanceSheetsUnaudited" id="Role_StatementCondensedConsolidatedBalanceSheetsUnaudited">
        <link:definition>100010 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureAcquisitionsSummaryOfConsiderationPaidAndAmountsRecognizedForAssetsAcquiredAndLiabilitiesAssumedDetails2" id="DisclosureAcquisitionsSummaryOfConsiderationPaidAndAmountsRecognizedForAssetsAcquiredAndLiabilitiesAssumedDetails2">
        <link:definition>100020 - Disclosure - Acquisitions - Summary of Consideration Paid and Amounts Recognized for Assets Acquired and Liabilities Assumed (Details) 2</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureLongtermDebtFairValueOfCompanysLongtermDebtObligationDetails2" id="DisclosureLongtermDebtFairValueOfCompanysLongtermDebtObligationDetails2">
        <link:definition>100030 - Disclosure - Long-term Debt - Fair Value of Company's Long-term Debt Obligation (Details) 2</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_StatementCondensedConsolidatedBalanceSheetsUnauditedParenthetical" id="Role_StatementCondensedConsolidatedBalanceSheetsUnauditedParenthetical">
        <link:definition>100040 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/StatementCondensedConsolidatedStatementsOfOperationsAndComprehensiveIncomeLossUnaudited" id="StatementCondensedConsolidatedStatementsOfOperationsAndComprehensiveIncomeLossUnaudited">
        <link:definition>100050 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited" id="Role_StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited">
        <link:definition>100060 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_StatementCondensedConsolidatedStatementOfChangesInStockholderSEquityUnaudited" id="Role_StatementCondensedConsolidatedStatementOfChangesInStockholderSEquityUnaudited">
        <link:definition>100070 - Statement - Condensed Consolidated Statement of Changes in Stockholder's Equity (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_StatementCondensedConsolidatedStatementOfChangesInMembersDeficitEquityUnaudited" id="Role_StatementCondensedConsolidatedStatementOfChangesInMembersDeficitEquityUnaudited">
        <link:definition>100080 - Statement - Condensed Consolidated Statement of Changes in Members' (Deficit) Equity (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureOrganizationNatureOfBusinessAndBasisOfPresentation" id="Role_DisclosureOrganizationNatureOfBusinessAndBasisOfPresentation">
        <link:definition>100090 - Disclosure - Organization, Nature of Business, and Basis of Presentation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies" id="Role_DisclosureSummaryOfSignificantAccountingPolicies">
        <link:definition>100100 - Disclosure - Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureAcquisitions" id="Role_DisclosureAcquisitions">
        <link:definition>100110 - Disclosure - Acquisitions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosurePropertyAndEquipmentNet" id="Role_DisclosurePropertyAndEquipmentNet">
        <link:definition>100120 - Disclosure - Property and Equipment, net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureGoodwillTradeNameAndCustomerLists" id="Role_DisclosureGoodwillTradeNameAndCustomerLists">
        <link:definition>100130 - Disclosure - Goodwill, Trade Name, and Customer Lists</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureLongTermDebt" id="Role_DisclosureLongTermDebt">
        <link:definition>100140 - Disclosure - Long-term Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureDerivatives" id="Role_DisclosureDerivatives">
        <link:definition>100150 - Disclosure - Derivatives</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureIncomeTaxes" id="Role_DisclosureIncomeTaxes">
        <link:definition>100160 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureRevenues" id="Role_DisclosureRevenues">
        <link:definition>100170 - Disclosure - Revenues</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureShareBasedCompensation" id="Role_DisclosureShareBasedCompensation">
        <link:definition>100180 - Disclosure - Share-Based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureEquity" id="Role_DisclosureEquity">
        <link:definition>100190 - Disclosure - Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureCommitmentsAndContingencies" id="Role_DisclosureCommitmentsAndContingencies">
        <link:definition>100200 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureRelatedPartyTransactions" id="Role_DisclosureRelatedPartyTransactions">
        <link:definition>100210 - Disclosure - Related Party Transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureNetIncomeLossPerShare" id="DisclosureNetIncomeLossPerShare">
        <link:definition>100220 - Disclosure - Net Income (Loss) Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies" id="Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies">
        <link:definition>100230 - Disclosure - Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables" id="Role_DisclosureSummaryOfSignificantAccountingPoliciesTables">
        <link:definition>100240 - Disclosure - Summary of Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureAcquisitionsTables" id="DisclosureAcquisitionsTables">
        <link:definition>100250 - Disclosure - Acquisitions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosurePropertyAndEquipmentNetTables" id="Role_DisclosurePropertyAndEquipmentNetTables">
        <link:definition>100260 - Disclosure - Property and Equipment, net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureGoodwillTradeNameAndCustomerListsTables" id="Role_DisclosureGoodwillTradeNameAndCustomerListsTables">
        <link:definition>100270 - Disclosure - Goodwill, Trade Name, and Customer Lists (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureLongTermDebtTables" id="Role_DisclosureLongTermDebtTables">
        <link:definition>100280 - Disclosure - Long-term Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureDerivativesTables" id="Role_DisclosureDerivativesTables">
        <link:definition>100290 - Disclosure - Derivatives (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureRevenuesTables" id="DisclosureRevenuesTables">
        <link:definition>100300 - Disclosure - Revenues (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureShareBasedCompensationTables" id="Role_DisclosureShareBasedCompensationTables">
        <link:definition>100310 - Disclosure - Share-Based Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureNetIncomeLossPerShareTables" id="DisclosureNetIncomeLossPerShareTables">
        <link:definition>100320 - Disclosure - Net Income (Loss) Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureOrganizationNatureOfBusinessAndBasisOfPresentationAdditionalInformationDetails" id="DisclosureOrganizationNatureOfBusinessAndBasisOfPresentationAdditionalInformationDetails">
        <link:definition>100330 - Disclosure - Organization, Nature of Business, and Basis of Presentation - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" id="Role_DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails">
        <link:definition>100340 - Disclosure - Summary of Significant Accounting Policies - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" id="Role_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails">
        <link:definition>100350 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails" id="DisclosureAcquisitionsAdditionalInformationDetails">
        <link:definition>100360 - Disclosure - Acquisitions - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureAcquisitionsSummaryOfConsiderationPaidAndAmountsRecognizedForAssetsAcquiredAndLiabilitiesAssumedDetails" id="DisclosureAcquisitionsSummaryOfConsiderationPaidAndAmountsRecognizedForAssetsAcquiredAndLiabilitiesAssumedDetails">
        <link:definition>100370 - Disclosure - Acquisitions - Summary of Consideration Paid and Amounts Recognized for Assets Acquired and Liabilities Assumed (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureAcquisitionsSummaryOfBusinessAcquisitionProFormaResultsDetails" id="DisclosureAcquisitionsSummaryOfBusinessAcquisitionProFormaResultsDetails">
        <link:definition>100380 - Disclosure - Acquisitions - Summary of Business Acquisition Pro Forma Results (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosurePropertyAndEquipmentNetSummaryOfPropertyAndEquipmentNetDetails" id="Role_DisclosurePropertyAndEquipmentNetSummaryOfPropertyAndEquipmentNetDetails">
        <link:definition>100390 - Disclosure - Property and Equipment, net - Summary of Property and Equipment, net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosurePropertyAndEquipmentNetAdditionalInformationDetails" id="DisclosurePropertyAndEquipmentNetAdditionalInformationDetails">
        <link:definition>100400 - Disclosure - Property and Equipment, net- Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureGoodwillTradeNameAndCustomerListsScheduleOfChangesInCarryingAmountOfGoodwillDetails" id="DisclosureGoodwillTradeNameAndCustomerListsScheduleOfChangesInCarryingAmountOfGoodwillDetails">
        <link:definition>100410 - Disclosure - Goodwill, Trade Name, and Customer Lists - Schedule of Changes in Carrying Amount of Goodwill (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureGoodwillTradeNameAndCustomerListsSummaryOfGrossCarryingValueAndAccumulatedAmortizationOfFinitelivedIntangibleAssetsDetails" id="DisclosureGoodwillTradeNameAndCustomerListsSummaryOfGrossCarryingValueAndAccumulatedAmortizationOfFinitelivedIntangibleAssetsDetails">
        <link:definition>100420 - Disclosure - Goodwill, Trade Name, and Customer Lists - Summary of Gross Carrying Value and Accumulated Amortization of Finite-Lived Intangible Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureGoodwillTradeNameAndCustomerListsAdditionalInformationDetails" id="DisclosureGoodwillTradeNameAndCustomerListsAdditionalInformationDetails">
        <link:definition>100430 - Disclosure - Goodwill, Trade Name, and Customer Lists - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureLongtermDebtFairValueOfCompanysLongtermDebtObligationDetails" id="DisclosureLongtermDebtFairValueOfCompanysLongtermDebtObligationDetails">
        <link:definition>100440 - Disclosure - Long-term Debt - Fair Value of Company's Long-term Debt Obligation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureLongtermDebtAdditionalInformationDetails" id="DisclosureLongtermDebtAdditionalInformationDetails">
        <link:definition>100450 - Disclosure - Long-term Debt - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureDerivativesAdditionalInformationDetails" id="Role_DisclosureDerivativesAdditionalInformationDetails">
        <link:definition>100460 - Disclosure - Derivatives - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureDerivativesSummaryOfLocationAndFairValueOfFinancialPositionAndLocationAndAmountOfGainsAndLossesRecordedRelatedToDerivativeIns" id="DisclosureDerivativesSummaryOfLocationAndFairValueOfFinancialPositionAndLocationAndAmountOfGainsAndLossesRecordedRelatedToDerivativeIns">
        <link:definition>100470 - Disclosure - Derivatives - Summary of Location and Fair Value of Financial Position and Location and Amount of Gains and Losses Recorded Related to Derivative Instruments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" id="DisclosureIncomeTaxesAdditionalInformationDetails">
        <link:definition>100480 - Disclosure - Income Taxes - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureRevenuesAdditionalInformationDetails" id="DisclosureRevenuesAdditionalInformationDetails">
        <link:definition>100490 - Disclosure - Revenues - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureRevenuesScheduleOfRevenuesByGeographicRegionDetails" id="Role_DisclosureRevenuesScheduleOfRevenuesByGeographicRegionDetails">
        <link:definition>100500 - Disclosure - Revenues - Schedule of Revenues by Geographic Region (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureSharebasedCompensationAdditionalInformationDetails" id="DisclosureSharebasedCompensationAdditionalInformationDetails">
        <link:definition>100510 - Disclosure - Share-Based Compensation - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureShareBasedCompensationSummaryOfRecognitionOfShareBasedCompensationRelatedToEmployeesDetails" id="Role_DisclosureShareBasedCompensationSummaryOfRecognitionOfShareBasedCompensationRelatedToEmployeesDetails">
        <link:definition>100520 - Disclosure - Share-Based Compensation - Summary of Recognition of Share-Based Compensation related to Employees (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureShareBasedCompensationSummaryOfAssumptionsAppliedToEstablishFairValueOfOptionsGrantedUsingBlackScholesOptionPricingModelDetails" id="Role_DisclosureShareBasedCompensationSummaryOfAssumptionsAppliedToEstablishFairValueOfOptionsGrantedUsingBlackScholesOptionPricingModelDetails">
        <link:definition>100530 - Disclosure - Share-Based Compensation - Summary of Assumptions Applied to Establish Fair Value of Options Granted Using Black-Scholes Option Pricing Model (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureSharebasedCompensationSummaryOfTheProfitsInterestActivityDetails" id="DisclosureSharebasedCompensationSummaryOfTheProfitsInterestActivityDetails">
        <link:definition>100540 - Disclosure - Share-Based Compensation - Summary of the Profits Interest Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureSharebasedCompensationSummaryOfTheOptionUnitActivityDetails" id="DisclosureSharebasedCompensationSummaryOfTheOptionUnitActivityDetails">
        <link:definition>100550 - Disclosure - Share-Based Compensation - Summary of the Option Unit Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureSharebasedCompensationSummaryOfTheRsuActivityDetails" id="DisclosureSharebasedCompensationSummaryOfTheRsuActivityDetails">
        <link:definition>100560 - Disclosure - Share-Based Compensation - Summary of the RSU Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/Role_DisclosureEquityAdditionalInformationDetails" id="Role_DisclosureEquityAdditionalInformationDetails">
        <link:definition>100570 - Disclosure - Equity - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" id="DisclosureCommitmentsAndContingenciesAdditionalInformationDetails">
        <link:definition>100580 - Disclosure - Commitments and Contingencies - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails" id="DisclosureRelatedPartyTransactionsAdditionalInformationDetails">
        <link:definition>100590 - Disclosure - Related Party Transactions - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureNetIncomeLossPerShareAdditionalInformationDetails" id="DisclosureNetIncomeLossPerShareAdditionalInformationDetails">
        <link:definition>100600 - Disclosure - Net Income (Loss) Per Share - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://fadv.com/20210630/taxonomy/role/DisclosureNetIncomeLossPerShareSummaryOfBasicAndDilutedNetIncomeLossPerShareDetails" id="DisclosureNetIncomeLossPerShareSummaryOfBasicAndDilutedNetIncomeLossPerShareDetails">
        <link:definition>100610 - Disclosure - Net Income (Loss) Per Share - Summary of Basic and Diluted Net Income (Loss) Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element id="fa_ShareBasedPaymentArrangementExpenseAbstract" name="ShareBasedPaymentArrangementExpenseAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_AcceleratedAmortizationOfDeferredFinancingCosts" name="AcceleratedAmortizationOfDeferredFinancingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_AdditionalCompensationExpenses" name="AdditionalCompensationExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerLists" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerLists" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTradeName" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTradeName" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_ConcentrationRiskNumberOfCountry" name="ConcentrationRiskNumberOfCountry" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_ConcentrationRiskNumberOfCustomers" name="ConcentrationRiskNumberOfCustomers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_CostOfServicesExcludingDepreciationAndAmortization" name="CostOfServicesExcludingDepreciationAndAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_CustomerListsNet" name="CustomerListsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_DebtInstrumentInterestRateReducedDuringPeriod" name="DebtInstrumentInterestRateReducedDuringPeriod" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_DeferredFinanceCostsLiabilitiesNonCurrent" name="DeferredFinanceCostsLiabilitiesNonCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="fa_DistributionsDeclaredToOptionHoldersButNotPaid" name="DistributionsDeclaredToOptionHoldersButNotPaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_EstimatedFairValueOfTheUnderlyingUnit" name="EstimatedFairValueOfTheUnderlyingUnit" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_ExchangedForCommonStockInTheCompany" name="ExchangedForCommonStockInTheCompany" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_ExchangedForRestrictedStockInTheCompany" name="ExchangedForRestrictedStockInTheCompany" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_GainLossDueToChangeInFairValueOfInterestRateSwaps" name="GainLossDueToChangeInFairValueOfInterestRateSwaps" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="fa_IndemnityLiability" name="IndemnityLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="fa_LongTermDeferredFinancingCost" name="LongTermDeferredFinancingCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="fa_MinorityInterestIncreaseFromContributionsByNoncontrollingInterestHolders" name="MinorityInterestIncreaseFromContributionsByNoncontrollingInterestHolders" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="fa_NumberOfParentSharesExchangedForEntityShares" name="NumberOfParentSharesExchangedForEntityShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="fa_OfferingCosts" name="OfferingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_OfferingCostsIncludedInAccountsPayableAndAccruedExpensesAndOtherCurrentLiabilities" name="OfferingCostsIncludedInAccountsPayableAndAccruedExpensesAndOtherCurrentLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_OfferingExpenses" name="OfferingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_OptionToPurchaseAdditionalSharesOfCommonStock" name="OptionToPurchaseAdditionalSharesOfCommonStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_PaymentsOfStockOptionCall" name="PaymentsOfStockOptionCall" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="fa_PaymentsOnDeferredPurchaseAgreements" name="PaymentsOnDeferredPurchaseAgreements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="fa_ProceedsFromIssuanceAfterDeductingUnderwritingDiscountsAndCommissions" name="ProceedsFromIssuanceAfterDeductingUnderwritingDiscountsAndCommissions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_ProfitInterestUnits" name="ProfitInterestUnits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_ProfitInterestUnitShares" name="ProfitInterestUnitShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_RevolvingCreditFacilityQuarterlyPaymentsPercentage" name="RevolvingCreditFacilityQuarterlyPaymentsPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedVesting" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedVesting" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExchangeForOptionInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExchangeForOptionInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_ShareBasedCompensationArrangementsByShareBasedPaymentAwardIssuedInExchangedForOptionsInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardIssuedInExchangedForOptionsInPeriodWeightedAverageExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExchangedForOptionsInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExchangedForOptionsInPeriodWeightedAverageExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_ShareBasedPaymentArrangementWeightedAverageAssumptions" name="ShareBasedPaymentArrangementWeightedAverageAssumptions" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_StockOptionExpirationPeriod" name="StockOptionExpirationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_StockOptionsPlanExpirationPeriod" name="StockOptionsPlanExpirationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_StockOptionUnits" name="StockOptionUnits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_TotalInsuranceRecoverableAsset" name="TotalInsuranceRecoverableAsset" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_TotalLabilitySettlementAndRelatedToAdministrativeFees" name="TotalLabilitySettlementAndRelatedToAdministrativeFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="fa_TradeNameNet" name="TradeNameNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_TransactionExpensesChangeInControl" name="TransactionExpensesChangeInControl" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_UnderwritingDiscountsAndCommissions" name="UnderwritingDiscountsAndCommissions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_UnpaidOfferingCost" name="UnpaidOfferingCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="fa_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_CapitalizedSoftwareAcquiredByBusinessCombinationMember" name="CapitalizedSoftwareAcquiredByBusinessCombinationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_CapitalizedSoftwareDevelopedInternallyOrOtherwisePurchasedMember" name="CapitalizedSoftwareDevelopedInternallyOrOtherwisePurchasedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_ClassALimitedPartnershipUnitsMember" name="ClassALimitedPartnershipUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_ClassALPUnitsClassBLPUnitsAndClassCLPUnitsMember" name="ClassALPUnitsClassBLPUnitsAndClassCLPUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_ClassBAwardsMember" name="ClassBAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_ClassBLimitedPartnershipUnitsMember" name="ClassBLimitedPartnershipUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_ClassCAwardsMember" name="ClassCAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_ClassCLimitedPartnershipUnitsMember" name="ClassCLimitedPartnershipUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_ClassOneCommonStockMember" name="ClassOneCommonStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_CLPUnitsMember" name="CLPUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_CommonClassABCMember" name="CommonClassABCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_CostOfServicesMember" name="CostOfServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_FastballHoldcoLPMember" name="FastballHoldcoLPMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_FirstAdvantageCorporationMember" name="FirstAdvantageCorporationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_FirstLienMember" name="FirstLienMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_FirstPortionOfCommonStockMember" name="FirstPortionOfCommonStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_March2021UKAcquisitionMember" name="March2021UKAcquisitionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_OperationsAndComprehensiveIncomeLossMember" name="OperationsAndComprehensiveIncomeLossMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_PredecessorPlanMember" name="PredecessorPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_PredecessorsMember" name="PredecessorsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_ProductAndTechnologyExpenseMember" name="ProductAndTechnologyExpenseMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_SecondLienMember" name="SecondLienMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_SecondPortionOfCommonStockMember" name="SecondPortionOfCommonStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_SilverLakeTransactionMember" name="SilverLakeTransactionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_SuccessorFirstLienCreditFacilityMember" name="SuccessorFirstLienCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_SuccessorPlanMember" name="SuccessorPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_SuccessorSecondLienCreditFacilityMember" name="SuccessorSecondLienCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_SymphonyTechnologyGroupMember" name="SymphonyTechnologyGroupMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_TermLoanDueJanuaryThirtyOneTwoThousandTwentyEightMember" name="TermLoanDueJanuaryThirtyOneTwoThousandTwentyEightMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_TermLoanDueJanuaryThirtyOneTwoThousandTwentySevenMember" name="TermLoanDueJanuaryThirtyOneTwoThousandTwentySevenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_TwoThousandTwentyOneEquityPlanMember" name="TwoThousandTwentyOneEquityPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_RecentAccountingPronouncementsPolicyTextBlock" name="RecentAccountingPronouncementsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="fa_IntialPublicOfferingPolicyPolicyTextBlock" name="IntialPublicOfferingPolicyPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="fa_ScheduleOfShareBasedCompensationProfitsInterestUnitActivityTableTextBlock" name="ScheduleOfShareBasedCompensationProfitsInterestUnitActivityTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
</xsd:schema>
