Set up sign-in for a specific Microsoft Entra organization in Azure Active Directory B2C

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This article shows you how to enable sign-in for users from a specific Microsoft Entra organization using a user flow in Azure AD B2C.

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.

Note

In Azure Active Directory B2C, custom policies are designed primarily to address complex scenarios. For most scenarios, we recommend that you use built-in user flows. If you've not done so, learn about custom policy starter pack in Get started with custom policies in Active Directory B2C.

Prerequisites

Register a Microsoft Entra app

To enable sign-in for users with a Microsoft Entra account from a specific Microsoft Entra organization, in Azure Active Directory B2C (Azure AD B2C), you need to create an application in the Azure portal. For more information, see Register an application with the Microsoft identity platform.

  1. Sign in to the Azure portal.

  2. If you have access to multiple tenants, select the Settings icon in the top menu to switch to your Microsoft Entra ID tenant from the Directories + subscriptions menu.

  3. In the Azure portal, search for and select Microsoft Entra ID.

  4. In the left menu, under Manage, select App registrations.

  5. Select + New registration.

  6. Enter a Name for your application. For example, Azure AD B2C App.

  7. Accept the default selection of Accounts in this organizational directory only (Default Directory only - Single tenant) for this application.

  8. For the Redirect URI, accept the value of Web, and enter the following URL in all lowercase letters, where your-B2C-tenant-name is replaced with the name of your Azure AD B2C tenant.

    https://your-B2C-tenant-name.b2clogin.cn/your-B2C-tenant-name.partner.onmschina.cn/oauth2/authresp

    For example, https://fabrikam.b2clogin.cn/fabrikam.partner.onmschina.cn/oauth2/authresp.

  9. Select Register. Record the Application (client) ID for use in a later step.

  10. Select Certificates & secrets, and then select New client secret.

  11. Enter a Description for the secret, select an expiration, and then select Add. Record the Value of the secret for use in a later step.

Configure Microsoft Entra ID as an identity provider

  1. If you have access to multiple tenants, select the Settings icon in the top menu to switch to your Azure AD B2C tenant from the Directories + subscriptions menu.

  2. Choose All services in the top-left corner of the Azure portal, and then search for and select Azure AD B2C.

  3. Select Identity providers, and then select New OpenID Connect provider.

  4. Enter a Name. For example, enter Contoso Microsoft Entra ID.

  5. For Metadata url, enter the following URL replacing {tenant} with the domain name of your Microsoft Entra tenant:

    https://login.partner.microsoftonline.cn/{tenant}/v2.0/.well-known/openid-configuration

    For example, https://login.partner.microsoftonline.cn/contoso.partner.onmschina.cn/v2.0/.well-known/openid-configuration.

  6. For Client ID, enter the application ID that you previously recorded.

  7. For Client secret, enter the client secret value that you previously recorded.

  8. For Scope, enter openid profile.

  9. Leave the default values for Response type, and Response mode.

  10. (Optional) For the Domain hint, enter contoso.com. For more information, see Set up direct sign-in using Azure Active Directory B2C.

  11. Under Identity provider claims mapping, select the following claims:

    • User ID: oid
    • Display name: name
    • Given name: given_name
    • Surname: family_name
    • Email: email

  12. Select Save.

Add Microsoft Entra identity provider to a user flow

At this point, the Microsoft Entra identity provider has been set up, but it's not yet available in any of the sign-in pages. To add the Microsoft Entra identity provider to a user flow:

  1. In your Azure AD B2C tenant, select User flows.
  2. Click the user flow that you want to add the Microsoft Entra identity provider.
  3. Under Settings, select Identity providers
  4. Under Custom identity providers, select Contoso Microsoft Entra ID.
  5. Select Save.
  6. To test your policy, select Run user flow.
  7. For Application, select a web application that you previously registered. The Reply URL should show https://jwt.ms.
  8. Select the Run user flow button.
  9. From the sign-up or sign-in page, select Contoso Microsoft Entra ID to sign in with Microsoft Entra Contoso account.

If the sign-in process is successful, your browser is redirected to https://jwt.ms, which displays the contents of the token returned by Azure AD B2C.

Create a policy key

You need to store the application key that you created in your Azure AD B2C tenant.

  1. If you have access to multiple tenants, select the Settings icon in the top menu to switch to your Azure AD B2C tenant from the Directories + subscriptions menu.
  2. Choose All services in the top-left corner of the Azure portal, and then search for and select Azure AD B2C.
  3. Under Policies, select Identity Experience Framework.
  4. Select Policy keys and then select Add.
  5. For Options, choose Manual.
  6. Enter a Name for the policy key. For example, ContosoAppSecret. The prefix B2C_1A_ is added automatically to the name of your key when it's created, so its reference in the XML in following section is to B2C_1A_ContosoAppSecret.
  7. In Secret, enter your client secret value that you recorded earlier.
  8. For Key usage, select Signature.
  9. Select Create.

Configure Microsoft Entra ID as an identity provider

To enable users to sign in using a Microsoft Entra account, you need to define Microsoft Entra ID as a claims provider that Azure AD B2C can communicate with through an endpoint. The endpoint provides a set of claims that are used by Azure AD B2C to verify that a specific user has authenticated.

You can define Microsoft Entra ID as a claims provider by adding Microsoft Entra ID to the ClaimsProvider element in the extension file of your policy.

  1. Open the TrustFrameworkExtensions.xml file.

  2. Find the ClaimsProviders element. If it does not exist, add it under the root element.

  3. Add a new ClaimsProvider as follows:

    <ClaimsProvider>
  <Domain>Contoso</Domain>
  <DisplayName>Login using Contoso</DisplayName>
  <TechnicalProfiles>
    <TechnicalProfile Id="AADContoso-OpenIdConnect">
      <DisplayName>Contoso Employee</DisplayName>
      <Description>Login with your Contoso account</Description>
      <Protocol Name="OpenIdConnect"/>
      <Metadata>
        <Item Key="METADATA">https://login.partner.microsoftonline.cn/tenant-name.partner.onmschina.cn/v2.0/.well-known/openid-configuration</Item>
        <Item Key="client_id">00000000-0000-0000-0000-000000000000</Item>
        <Item Key="response_types">code</Item>
        <Item Key="scope">openid profile</Item>
        <Item Key="response_mode">form_post</Item>
        <Item Key="HttpBinding">POST</Item>
        <Item Key="UsePolicyInRedirectUri">false</Item>
      </Metadata>
      <CryptographicKeys>
        <Key Id="client_secret" StorageReferenceId="B2C_1A_ContosoAppSecret"/>
      </CryptographicKeys>
      <OutputClaims>
        <OutputClaim ClaimTypeReferenceId="issuerUserId" PartnerClaimType="oid"/>
        <OutputClaim ClaimTypeReferenceId="tenantId" PartnerClaimType="tid"/>
        <OutputClaim ClaimTypeReferenceId="givenName" PartnerClaimType="given_name" />
        <OutputClaim ClaimTypeReferenceId="surName" PartnerClaimType="family_name" />
        <OutputClaim ClaimTypeReferenceId="displayName" PartnerClaimType="name" />
        <OutputClaim ClaimTypeReferenceId="authenticationSource" DefaultValue="socialIdpAuthentication" AlwaysUseDefaultValue="true" />
        <OutputClaim ClaimTypeReferenceId="identityProvider" PartnerClaimType="iss" />
      </OutputClaims>
      <OutputClaimsTransformations>
        <OutputClaimsTransformation ReferenceId="CreateRandomUPNUserName"/>
        <OutputClaimsTransformation ReferenceId="CreateUserPrincipalName"/>
        <OutputClaimsTransformation ReferenceId="CreateAlternativeSecurityId"/>
        <OutputClaimsTransformation ReferenceId="CreateSubjectClaimFromAlternativeSecurityId"/>
      </OutputClaimsTransformations>
      <UseTechnicalProfileForSessionManagement ReferenceId="SM-SocialLogin"/>
    </TechnicalProfile>
  </TechnicalProfiles>
</ClaimsProvider>

  4. Under the ClaimsProvider element, update the value for Domain to a unique value that can be used to distinguish it from other identity providers. For example Contoso. You don't put a .com at the end of this domain setting.

  5. Under the ClaimsProvider element, update the value for DisplayName to a friendly name for the claims provider. This value is not currently used.

Update the technical profile

To get a token from the Microsoft Entra endpoint, you need to define the protocols that Azure AD B2C should use to communicate with Microsoft Entra ID. This is done inside the TechnicalProfile element of ClaimsProvider.

  1. Update the ID of the TechnicalProfile element. This ID is used to refer to this technical profile from other parts of the policy, for example AADContoso-OpenIdConnect.
  2. Update the value for DisplayName. This value will be displayed on the sign-in button on your sign-in screen.
  3. Update the value for Description.
  4. Microsoft Entra ID uses the OpenID Connect protocol, so make sure that the value for Protocol is OpenIdConnect.
  5. Set value of the METADATA to https://login.partner.microsoftonline.cn/tenant-name.partner.onmschina.cn/v2.0/.well-known/openid-configuration, where tenant-name is your Microsoft Entra tenant name. For example, https://login.partner.microsoftonline.cn/contoso.partner.onmschina.cn/v2.0/.well-known/openid-configuration
  6. Set client_id to the application ID from the application registration.
  7. Under CryptographicKeys, update the value of StorageReferenceId to the name of the policy key that you created earlier. For example, B2C_1A_ContosoAppSecret.

Add a user journey

At this point, the identity provider has been set up, but it's not yet available in any of the sign-in pages. If you don't have your own custom user journey, create a duplicate of an existing template user journey, otherwise continue to the next step.

  1. Open the TrustFrameworkBase.xml file from the starter pack.
  2. Find and copy the entire contents of the UserJourney element that includes Id="SignUpOrSignIn".
  3. Open the TrustFrameworkExtensions.xml and find the UserJourneys element. If the element doesn't exist, add one.
  4. Paste the entire content of the UserJourney element that you copied as a child of the UserJourneys element.
  5. Rename the Id of the user journey. For example, Id="CustomSignUpSignIn".

Add the identity provider to a user journey

Now that you have a user journey, add the new identity provider to the user journey. You first add a sign-in button, then link the button to an action. The action is the technical profile you created earlier.

  1. Find the orchestration step element that includes Type="CombinedSignInAndSignUp", or Type="ClaimsProviderSelection" in the user journey. It's usually the first orchestration step. The ClaimsProviderSelections element contains a list of identity providers that a user can sign in with. The order of the elements controls the order of the sign-in buttons presented to the user. Add a ClaimsProviderSelection XML element. Set the value of TargetClaimsExchangeId to a friendly name.

  2. In the next orchestration step, add a ClaimsExchange element. Set the Id to the value of the target claims exchange Id. Update the value of TechnicalProfileReferenceId to the Id of the technical profile you created earlier.

The following XML demonstrates the first two orchestration steps of a user journey with the identity provider:

<OrchestrationStep Order="1" Type="CombinedSignInAndSignUp" ContentDefinitionReferenceId="api.signuporsignin">
  <ClaimsProviderSelections>
    ...
    <ClaimsProviderSelection TargetClaimsExchangeId="AzureADContosoExchange" />
  </ClaimsProviderSelections>
  ...
</OrchestrationStep>

<OrchestrationStep Order="2" Type="ClaimsExchange">
  ...
  <ClaimsExchanges>
    <ClaimsExchange Id="AzureADContosoExchange" TechnicalProfileReferenceId="AADContoso-OpenIdConnect" />
  </ClaimsExchanges>
</OrchestrationStep>

Configure the relying party policy

The relying party policy, for example SignUpSignIn.xml, specifies the user journey which Azure AD B2C will execute. Find the DefaultUserJourney element within relying party. Update the ReferenceId to match the user journey ID, in which you added the identity provider.

In the following example, for the CustomSignUpSignIn user journey, the ReferenceId is set to CustomSignUpSignIn:

<RelyingParty>
  <DefaultUserJourney ReferenceId="CustomSignUpSignIn" />
  ...
</RelyingParty>

Upload the custom policy

  1. Sign in to the Azure portal.
  2. Select the Directory + Subscription icon in the portal toolbar, and then select the directory that contains your Azure AD B2C tenant.
  3. In the Azure portal, search for and select Azure AD B2C.
  4. Under Policies, select Identity Experience Framework.
  5. Select Upload Custom Policy, and then upload the two policy files that you changed, in the following order: the extension policy, for example TrustFrameworkExtensions.xml, then the relying party policy, such as SignUpSignIn.xml.

Test your custom policy

  1. Select your relying party policy, for example B2C_1A_signup_signin.
  2. For Application, select a web application that you previously registered. The Reply URL should show https://jwt.ms.
  3. Select the Run now button.
  4. From the sign-up or sign-in page, select Contoso Employee to sign in with Microsoft Entra Contoso account.

If the sign-in process is successful, your browser is redirected to https://jwt.ms, which displays the contents of the token returned by Azure AD B2C.

[Optional] Configuring optional claims

If you want to get the family_name and given_name claims from Microsoft Entra ID, you can configure optional claims for your application in the Azure portal UI or application manifest. For more information, see How to provide optional claims to your Microsoft Entra app.

  1. Sign in to the Azure portal using your organizational Microsoft Entra tenant. Or if you're already signed in, make sure you're using the directory that contains your organizational Microsoft Entra tenant (for example, Contoso):
    1. Select the Directories + subscriptions icon in the portal toolbar.
    2. On the Portal settings | Directories + subscriptions page, find your Microsoft Entra directory in the Directory name list, and then select Switch.
  2. In the Azure portal, search for and select Microsoft Entra ID.
  3. In the left menu, under Manage, select App registrations.
  4. Select the application you want to configure optional claims for in the list, such as Azure AD B2C App.
  5. From the Manage section, select Token configuration.
  6. Select Add optional claim.
  7. For the Token type, select ID.
  8. Select the optional claims to add, family_name and given_name.
  9. Select Add. If Turn on the Microsoft Graph profile permission (required for claims to appear in token) appears, enable it, and then select Add again.

Next steps

Learn how to pass the Microsoft Entra token to your application.