Password change and Authenticator doesn't work

Hi @Scott Miller, 

Thank you for posting your question in the Microsoft Q&A forum.  

Based on my research and experience, this typically happens because the password change invalidates the cached credentials used by Outlook and the Microsoft Authenticator app. This can create a loop where multi-factor authentication (MFA) cannot complete successfully. 

To resolve this, the most effective approach is to reset the user's MFA registration from the Microsoft Entra Admin Center: 

• Sign in to the Microsoft Entra admin center as a Global Administrator or Authentication Administrator. 
• Go to Users > All users, then select the affected user. 
• Under Authentication methods, choose: Revoke MFA sessions and Require re-register MFA. 

This action will deactivate any hardware OATH tokens and remove the user's registered authentication methods (e.g., phone numbers, Authenticator app, software tokens). The next time the user signs in, they’ll be prompted to set up a new MFA method, allowing them to reconfigure the Microsoft Authenticator app with their updated credentials. 

Note: If you're an end-user, please contact your IT administrator or Global Admin to assist with this process. 

For more details, you can refer to this official documentation: Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID |… 

I truly appreciate your patience and the time you took to raise this concern. If you have any updates or further questions, feel free to leave a comment under this post. I’ll be happy to assist further. 

Thank you again for your understanding! 

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