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Unable to login after Entra ID tenant migration

Dale Walker 0 Reputation points
2025-08-28T02:04:35.3533333+00:00

We have migrated a client into a new Entra ID tenant. All Microsoft Ads users are no longer able to login using their work account after the migration. The login is successfully redirected to the correct tenant for authentication. The user receives the following error from the ads platform after authenticating. "Sorry we're unable to sign you in because of an issue with your user name. Please contact Microsoft Advertising support for further assistance."

We have already tried deleting an account and sending a new invite however the issue persists.

Microsoft Advertising | Accounts, profiles, and login | Users and permissions

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  1. MS Advertising - Vahid 340 Reputation points Microsoft External Staff Moderator
    2025-08-28T07:26:51.4366667+00:00

    Hello Dale,

    Thank you for using our Microsoft Advertising Learn Q&A Platform! 

    Since your client is experiencing login challenges, I hope the information provided here will be a good starting point for further investigation.

    When users are unable to sign in to Microsoft Advertising with their work account after a migration to a new Entra ID (Azure AD) tenant, and receive the error about an issue with their username, the following steps and considerations are relevant:

    • Ensure that the user’s work account is properly provisioned in the new tenant and that it is authenticated by Azure Active Directory. If the user’s account is not recognized as a valid work account in the new tenant, access will be blocked.
    • In User Management, check if the user is listed as “Blocked.” If so, you may need to unblock the account or provide a new work account for the user.
    • If users have both a personal and work account with the same email, they may be prompted to choose between them. Make sure they select the correct work account during sign-in.
    • If the issue persists after deleting and re-inviting the user, it may be necessary to contact Microsoft Advertising support for manual verification and further assistance, as recommended by the error message and support documentation.
    • For API users, ensure that the application registration in Azure is configured to support both personal and work accounts, and that permissions and endpoints are set correctly.

    Our support teams are also happy to discuss your account in more detail via phone, chat or email to provide review assistance, please see our support page to reach out! 

     

    I hope the information provided here will at least partly answer your question.  If you have any additional questions please do not hesitate to reach out to our support. I have also sent you a private message asking for further details. You are more than welcome to respond to me to that I can begin the investigation on my end.

     

    Kind regards, 

    Vahid | Microsoft Advertising Support Specialist | 800-518-5689

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