Does ADB2C support pre-filled username in first page?

Question

My situation is the customer will first enter their username on my web page, then my backend will check the username are using and which service to do the authentication, then route him to ADB2C.

From a UX perspective, the customer already entered their username on the last page, I shouldn’t ask them again on the second page of the ADB2C page, want to understand does ADB2C could let me pass the username to the URL or something, so that customer only requires to enter the password in the second page.

Answer 1

Hi @Michael Lau ,

Thanks for reaching out.

Azure AD B2C allow you to pass "login_hint" query string parameter to the OpenID Connect authentication request which allow to automatically populates the sign-in name, while the user only needs to provide the password.

For a custom policy, you can add the login_hint by adding the "DefaultValue" attribute to the "signInName" input claim for the "SelfAsserted-LocalAccountSignin-Email" technical profile as :

<ClaimsProvider>  
  <DisplayName>Local Account</DisplayName>  
  <TechnicalProfiles>  
    <TechnicalProfile Id="SelfAsserted-LocalAccountSignin-Email">  
      <InputClaims>  
        <!-- Add the login hint value to the sign-in names claim type -->  
        <InputClaim ClaimTypeReferenceId="signInName" DefaultValue="{OIDC:LoginHint}" />  
      </InputClaims>**  
    </TechnicalProfile>  
  </TechnicalProfiles>  
</ClaimsProvider>  

Reference: https://learn.microsoft.com/en-us/azure/active-directory-b2c/direct-signin?pivots=b2c-custom-policy

Hope this will help.

Thanks,
Shweta

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