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Copy file name to clipboardExpand all lines: articles/active-directory/authentication/howto-authentication-use-email-signin.md
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@@ -6,7 +6,7 @@ services: active-directory
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ms.service: active-directory
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ms.subservice: authentication
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ms.topic: how-to
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ms.date: 07/07/2021
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ms.date: 06/17/2022
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ms.author: justinha
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author: calui
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* Changing the Azure AD UPN creates a mismatch between on-premises and Azure AD environments that could cause problems with certain applications and services.
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* Due to business or compliance reasons, the organization doesn't want to use the on-premises UPN to sign in to Azure AD.
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To help with the move to hybrid authentication, you can configure Azure AD to let users sign in with their email as an alternate login ID. For example, if *Contoso* rebranded to *Fabrikam*, rather than continuing to sign in with the legacy `[email protected]` UPN, email as an alternate login ID can be used. To access an application or service, users would sign in to Azure AD using their non-UPN email, such as `[email protected]`.
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To move toward hybrid authentication, you can configure Azure AD to let users sign in with their email as an alternate login ID. For example, if *Contoso* rebranded to *Fabrikam*, rather than continuing to sign in with the legacy `[email protected]` UPN, email as an alternate login ID can be used. To access an application or service, users would sign in to Azure AD using their non-UPN email, such as `[email protected]`.
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This article shows you how to enable and use email as an alternate login ID.
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* The feature supports managed authentication with Password Hash Sync (PHS) or Pass-Through Authentication (PTA).
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* There are two options for configuring the feature:
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*[Home Realm Discovery (HRD) policy](#enable-user-sign-in-with-an-email-address) - Use this option to enable the feature for the entire tenant. Global administrator privileges required.
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*[Staged rollout policy](#enable-staged-rollout-to-test-user-sign-in-with-an-email-address) - Use this option to test the feature with specific Azure AD groups. Global administrator privileges required.
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*[Staged rollout policy](#enable-staged-rollout-to-test-user-sign-in-with-an-email-address) - Use this option to test the feature with specific Azure AD groups. Global administrator privileges required. When you first add a security group for staged rollout, you're limited to 200 users to avoid a UX time-out. After you've added the group, you can add more users directly to it, as required.
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## Preview limitations
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## B2B guest user sign-in with an email address
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Email as an alternate login ID applies to [Azure AD B2B collaboration](../external-identities/what-is-b2b.md) under a "bring your own sign-in identifiers" model. When email as an alternate login ID is enabled in the home tenant, Azure AD users can perform guest sign in with non-UPN email on the resource tenanted endpoint. No action is required from the resource tenant to enable this functionality.
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Email as an alternate login ID applies to [Azure AD B2B collaboration](../external-identities/what-is-b2b.md) under a "bring your own sign-in identifiers" model. When email as an alternate login ID is enabled in the home tenant, Azure AD users can perform guest sign in with non-UPN email on the resource tenant endpoint. No action is required from the resource tenant to enable this functionality.
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## Enable user sign-in with an email address
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1. Search for and select **Azure Active Directory**.
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1. From the navigation menu on the left-hand side of the Azure Active Directory window, select **Azure AD Connect > Email as alternate login ID**.
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1. Click the checkbox next to *Email as an alternate login ID*.
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1. Click **Save**.
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With the policy applied, it can take up to 1 hour to propagate and for users to be able to sign in using their alternate login ID.
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### Sign-in logs
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:::image type="content" border="true" source="./media/howto-authentication-use-email-signin/email-alternate-login-id-logs.png" alt-text="Screenshot of Azure A D sign-in logs showing email as alternate login I D activity.":::
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:::image type="content" border="true" source="./media/howto-authentication-use-email-signin/email-alternate-login-id-logs.png" alt-text="Screenshot of Azure A D sign-in logs showing email as alternate login ID activity.":::
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You can review the [sign-in logs in Azure AD][sign-in-logs] for more information. Sign-ins with email as an alternate login ID will emit `proxyAddress` in the *Sign-in identifier type* field and the inputted username in the *Sign-in identifier* field.
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