How to Pass User Input Values from One Technical Profile to Another in Azure AD B2C Custom Policy?

Question

I'm working on a custom policy in Azure AD B2C and I'm trying to pass user input values from one technical profile to another within the orchestration steps. Specifically, I have a self-asserted technical profile for user sign-in where the user enters their email and password. After obtaining these values, I need to pass them to a REST API technical profile to make a request and validate the user against a custom database.

I've tried using ClaimsTransformations within the orchestration steps, but I haven't been successful.

These are the 2 technical profiles.

<TechnicalProfile Id="REST-API-SignUp">
          <DisplayName>Validate user's input data and return loyaltyNumber claim</DisplayName>
          <Protocol Name="Proprietary" Handler="Web.TPEngine.Providers.RestfulProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
          <Metadata>
            <Item Key="ServiceUrl">https://146a-112-134-225-150.ngrok-free.app/api/auth/login</Item>
            <Item Key="AuthenticationType">None</Item>
            <Item Key="SendClaimsIn">Body</Item>
          </Metadata>
        </TechnicalProfile>

        <!-- This technical profile uses a validation technical profile to authenticate the user. -->
        <TechnicalProfile Id="SelfAsserted-LocalAccountSignin-Email">
          <DisplayName>Local Account Signin</DisplayName>
          <Protocol Name="Proprietary" Handler="Web.TPEngine.Providers.SelfAssertedAttributeProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
          <Metadata>
            <Item Key="SignUpTarget">SignUpWithLogonEmailExchange</Item>
            <Item Key="setting.operatingMode">Email</Item>
            <Item Key="ContentDefinitionReferenceId">api.localaccountsignin</Item>
            <Item Key="IncludeClaimResolvingInClaimsHandling">true</Item>
          </Metadata>
          <IncludeInSso>false</IncludeInSso>
          <InputClaims>
           <InputClaim ClaimTypeReferenceId="signInName" />
           <InputClaim ClaimTypeReferenceId="password" />
          </InputClaims>
          <OutputClaims>
            <OutputClaim ClaimTypeReferenceId="signInName" Required="true" />
            <OutputClaim ClaimTypeReferenceId="password" Required="true" />
            <OutputClaim ClaimTypeReferenceId="objectId" />
            <OutputClaim ClaimTypeReferenceId="authenticationSource" />
          </OutputClaims>
          <ValidationTechnicalProfiles>
            <ValidationTechnicalProfile ReferenceId="login-NonInteractive" />
          </ValidationTechnicalProfiles>
          <UseTechnicalProfileForSessionManagement ReferenceId="SM-AAD" />
        </TechnicalProfile>

These are the orchestration steps.

<OrchestrationStep Order="1" Type="CombinedSignInAndSignUp" ContentDefinitionReferenceId="api.signuporsignin">
  <ClaimsProviderSelections>
    <ClaimsProviderSelection ValidationClaimsExchangeId="LocalAccountSigninEmailExchange" />
  </ClaimsProviderSelections>
  <ClaimsExchanges>
    <ClaimsExchange Id="LocalAccountSigninEmailExchange" TechnicalProfileReferenceId="SelfAsserted-LocalAccountSignin-Email" />
  </ClaimsExchanges>
</OrchestrationStep>

<OrchestrationStep Order="2" Type="ClaimsExchange" ContentDefinitionReferenceId="api.localaccountpasswordreset">
  <ClaimsProviderSelections>
    <ClaimsProviderSelection ValidationClaimsExchangeId="LocalAccountSigninEmailExchange" />
  </ClaimsProviderSelections>
  <ClaimsExchanges>
    <ClaimsExchange Id="RestApiSignUp" TechnicalProfileReferenceId="REST-API-SignUp" />
  </ClaimsExchanges>
</OrchestrationStep>

Can anyone provide guidance on the correct approach to achieve this? Is there a specific method or configuration that needs to be followed to pass user input values between technical profiles in Azure AD B2C custom policies?

Answer 1

Just make email and password input claims in the API.

Refer to this.

But beware. "password" is only available in the sign-in TP.

So you need to copy it via OutputTransformation to some other value and use that in the API.

Also, step 2 seems wrong:

<OrchestrationStep Order="2" Type="ClaimsExchange">
  <ClaimsExchanges>
    <ClaimsExchange Id="RestApiSignUp" TechnicalProfileReferenceId="REST-API-SignUp" />
  </ClaimsExchanges>
</OrchestrationStep>