Today we’re announcing the public preview of the ability to sign-in to Azure AD with email in addition to UPN (UserPrincipalName). In organizations where email and UPN are not the same, it can be confusing for users when they can't use their familiar email address to sign-in. With this preview capability, you can enable your users to sign in with either their UPN or their email address, helping them avoid this confusion.
This feature can be enabled by setting the AlternateIdLogin attribute in the HomeRealmDiscoveryPolicy. Please use the instructions in our documentation to set this up in your organization.
Some customers are using capabilities in Azure Active Directory (Azure AD) Connect to achieve this today, but that requires them to set the email address as the UPN in Azure AD. With this preview capability, you can now use the same UPN across on-premises Active Directory and Azure AD to achieve the best compatibility across Office 365 and other workloads, while still allowing your users to sign in with either their UPN or email, further simplifying their experience.
We hope this change simplifies the sign-in experience for your end users.
As always, we’d love to hear any feedback or suggestions you may have. Please let us know what you think in the comments below or on the Azure AD feedback forum.
Stay safe and be well,
Alex Simons (@Alex_A_Simons)
Corporate VP of Program Management
Microsoft Identity Division
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