Set up direct sign-in using Azure Active Directory B2C

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Before you begin, use the Choose a policy type selector at the top of this page to choose the type of policy you’re setting up. Azure Active Directory B2C offers two methods to define how users interact with your applications: through predefined user flows or through fully configurable custom policies. The steps required in this article are different for each method.

When you set up sign-in for your application using Azure Active Directory B2C (Azure AD B2C), you can prepopulate the sign-in name or directly sign in to a specific social identity provider.

Prepopulate the sign in name

During a sign-in user journey, a relying party application may target a specific user or domain name. When targeting a user, an application can specify, in the authorization request, the login_hint query parameter with the user sign-in name. Azure AD B2C automatically populates the sign-in name, while the user only needs to provide the password.

Sign up sign in page with login_hint query param highlighted in URL

The user is able to change the value in the sign-in textbox.

To support sign in hint parameter, override the SelfAsserted-LocalAccountSignin-Email technical profile. In the <InputClaims> section, set the DefaultValue of the signInName claim to {OIDC:LoginHint}. The {OIDC:LoginHint} variable contains the value of the login_hint parameter. Azure AD B2C reads the value of the signInName claim and pre-populates the signInName textbox.

<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>

Redirect sign in to a social provider

If you configured the sign-in journey for your application to include social accounts, you can specify the domain_hint parameter. This query parameter provides a hint to Azure AD B2C about the social identity provider that should be used for sign-in.

Sign up sign in page with domain_hint query param highlighted in URL

The domain hint query string parameter can set to one of the following domains:

To support domain hint parameter, you can configure the domain name using the <Domain>domain name</Domain> XML element of any <ClaimsProvider>.

<ClaimsProvider>
    <!-- Add the domain hint value to the claims provider -->
    <Domain>wechat.com</Domain>
    <DisplayName>Wechat</DisplayName>
    <TechnicalProfiles>
    ...