Azure B2C Custom Policy - Showing button on validation

Question

It looks like there is not a lot of help and forums on the Azure B2C Custom policy framework.

I have used the following technical profile for my custom policy.

<TechnicalProfile Id="AAD-UserReadUsingEmailAddress">
          <Metadata>
            <Item Key="Operation">Read</Item>
            <Item Key="RaiseErrorIfClaimsPrincipalDoesNotExist">true</Item>
            <Item Key="UserMessageIfClaimsPrincipalDoesNotExist">An account could not be found for the provided user ID.</Item>
          </Metadata>
          <IncludeInSso>false</IncludeInSso>
          <InputClaims>
            <InputClaim ClaimTypeReferenceId="email" PartnerClaimType="signInNames.emailAddress" Required="true" />
          </InputClaims>
          <OutputClaims>
            <!-- Required claims -->
            <OutputClaim ClaimTypeReferenceId="objectId" />
            <OutputClaim ClaimTypeReferenceId="authenticationSource" DefaultValue="localAccountAuthentication" />

            <OutputClaim ClaimTypeReferenceId="strongAuthenticationPhoneNumber" />

            <!-- Optional claims -->
            <OutputClaim ClaimTypeReferenceId="userPrincipalName" />
            <OutputClaim ClaimTypeReferenceId="displayName" />
            <OutputClaim ClaimTypeReferenceId="accountEnabled" />
            <OutputClaim ClaimTypeReferenceId="otherMails" />
            <OutputClaim ClaimTypeReferenceId="signInNames.emailAddress" />
          </OutputClaims>
          <OutputClaimsTransformations>
            <OutputClaimsTransformation ReferenceId="AssertAccountEnabledIsTrue" />
          </OutputClaimsTransformations>
          <IncludeTechnicalProfile ReferenceId="AAD-Common" />
        </TechnicalProfile>

This profile looks for the user and comes back with an error message if the user was not found in AD. However I want to show the user a button to sign up after the validation happens. How can I achieve this?

Any help will be appreciated!

Answer 1

Azure AD B2C Custom Policy is now a GA product and it has a lot of good documentation available.

What you want to achieve here very common and has been explained in starter pack. Its called a signuporsignin policy. Walk through the article https://docs.microsoft.com/en-us/azure/active-directory-b2c/active-directory-b2c-get-started-custom

You can also see the policies here https://github.com/Azure-Samples/active-directory-b2c-custom-policy-starterpack/blob/master/SocialAndLocalAccountsWithMfa/TrustFrameworkBase.xml

Look at this technical profile https://github.com/Azure-Samples/active-directory-b2c-custom-policy-starterpack/blob/master/SocialAndLocalAccountsWithMfa/TrustFrameworkBase.xml#L981

providing this metadata might help

  <Metadata>
            <Item Key="SignUpTarget">SignUpWithLogonEmailExchange</Item>
            <Item Key="setting.operatingMode">Email</Item>
            <Item Key="ContentDefinitionReferenceId">api.selfasserted</Item>
          </Metadata>