Troubleshooting Azure B2C MFA Integration with Application

I am setting up Azure B2C integration with our application. I want to enable two-factor authentication (MFA) where the user can choose between phone or email for the verification process. When I select MFA via phone and enter the code I receive, I am unable to proceed further into the application, and I get an error message: "504 Gateway Time-out The server didn't respond in time." I followed the Azure B2C setup instructions for the policy, so I’m unsure where the issue lies. There was also an earlier problem where the system wouldn’t let me proceed and kept redirecting me back to the MFA selection page. Can you help me resolve this?
Policy Azure B2C:

<UserJourney Id="SignUpOrSignIn" DefaultCpimIssuerTechnicalProfileReferenceId="JwtIssuer">

  <OrchestrationSteps>

    <OrchestrationStep Order="1" Type="CombinedSignInAndSignUp" ContentDefinitionReferenceId="api.signuporsignin">

      <ClaimsProviderSelections>

        <!-- <ClaimsProviderSelection TargetClaimsExchangeId="FacebookExchange"/> -->

        <ClaimsProviderSelection ValidationClaimsExchangeId="LocalAccountSigninEmailExchange" />

      </ClaimsProviderSelections>

      <ClaimsExchanges>

        <ClaimsExchange Id="LocalAccountSigninEmailExchange" TechnicalProfileReferenceId="SelfAsserted-LocalAccountSignin-Email" />

      </ClaimsExchanges>

    </OrchestrationStep>

    <!-- Check if the user has selected to sign in using one of the social providers -->

    <OrchestrationStep Order="2" Type="ClaimsExchange">

      <Preconditions>

        <Precondition Type="ClaimsExist" ExecuteActionsIf="true">

          <Value>objectId</Value>

          <Action>SkipThisOrchestrationStep</Action>

        </Precondition>

      </Preconditions>

      <ClaimsExchanges>

        <!-- <ClaimsExchange Id="FacebookExchange" TechnicalProfileReferenceId="Facebook-OAUTH"/> -->

        <ClaimsExchange Id="SignUpWithLogonEmailExchange" TechnicalProfileReferenceId="LocalAccountSignUpWithLogonEmail" />

      </ClaimsExchanges>

    </OrchestrationStep>

   

  

  

    <!--Sample: If uses is enrolled for MFA, ask the user to select the preferred method-->

    <OrchestrationStep Order="3" Type="ClaimsExchange">

      <Preconditions>

        <Precondition Type="ClaimsExist" ExecuteActionsIf="true">

          <Value>extension_mfaByPhoneOrEmail</Value>

          <Action>SkipThisOrchestrationStep</Action>

        </Precondition>

      </Preconditions>

      <ClaimsExchanges>

        <ClaimsExchange Id="SelfAsserted-Select-MFA-Method" TechnicalProfileReferenceId="SelfAsserted-Select-MFA-Method" />

      </ClaimsExchanges>

    </OrchestrationStep>

    <!-- Throw error if control was bypassed -->

    <OrchestrationStep Order="4" Type="SendClaims" CpimIssuerTechnicalProfileReferenceId="Return-MFA-Method-Incorrect-Error">

      <Preconditions>

        <Precondition Type="ClaimEquals" ExecuteActionsIf="true">

          <Value>extension_mfaByPhoneOrEmail</Value>

          <Value>email</Value>

          <Action>SkipThisOrchestrationStep</Action>

        </Precondition>

        <Precondition Type="ClaimEquals" ExecuteActionsIf="true">

          <Value>extension_mfaByPhoneOrEmail</Value>

          <Value>phone</Value>

          <Action>SkipThisOrchestrationStep</Action>

        </Precondition>

      </Preconditions>

    </OrchestrationStep>

    <!-- Phone verification: If MFA is not required, the next three steps (#5-#7) should be removed.

         This step checks whether there's a phone number on record,  for the user. If found, then the user is challenged to verify it. -->

    <OrchestrationStep Order="5" Type="ClaimsExchange">

      <Preconditions>

        <Precondition Type="ClaimsExist" ExecuteActionsIf="true">

          <Value>isActiveMFASession</Value>

          <Action>SkipThisOrchestrationStep</Action>

        </Precondition>

        <!--Sample: If the preferred MFA method is not 'phone' skip this orchestration step-->

        <Precondition Type="ClaimEquals" ExecuteActionsIf="false">

          <Value>extension_mfaByPhoneOrEmail</Value>

          <Value>phone</Value>

          <Action>SkipThisOrchestrationStep</Action>

        </Precondition>

      </Preconditions>

      <ClaimsExchanges>

        <ClaimsExchange Id="PhoneFactor-Verify" TechnicalProfileReferenceId="PhoneFactor-InputOrVerify" />

      </ClaimsExchanges>

    </OrchestrationStep>

    <!-- Save MFA phone number: The precondition verifies whether the user provided a new number in the 

         previous step. If so, then the phone number is stored in the directory for future authentication 

         requests. -->

    <OrchestrationStep Order="6" Type="ClaimsExchange">

      <Preconditions>

        <Precondition Type="ClaimsExist" ExecuteActionsIf="false">

          <Value>newPhoneNumberEntered</Value>

          <Action>SkipThisOrchestrationStep</Action>

        </Precondition>

      </Preconditions>

      <ClaimsExchanges>

        <ClaimsExchange Id="AADUserWriteWithObjectId" TechnicalProfileReferenceId="AAD-UserWritePhoneNumberUsingObjectId" />

      </ClaimsExchanges>

    </OrchestrationStep>

    <!--Sample: MFA with email-->

    <OrchestrationStep Order="7" Type="ClaimsExchange">

      <Preconditions>

        <Precondition Type="ClaimEquals" ExecuteActionsIf="false">

          <Value>extension_mfaByPhoneOrEmail</Value>

          <Value>email</Value>

          <Action>SkipThisOrchestrationStep</Action>

        </Precondition>

      </Preconditions>

      <ClaimsExchanges>

        <ClaimsExchange Id="Email-Verify" TechnicalProfileReferenceId="EmailVerifyOnSignIn" />

      </ClaimsExchanges>

    </OrchestrationStep> 

    <OrchestrationStep Order="8" Type="SendClaims" CpimIssuerTechnicalProfileReferenceId="JwtIssuer" />

  </OrchestrationSteps>

  <ClientDefinition ReferenceId="DefaultWeb" />

</UserJourney>