Microsoft 365 - Troubleshooting
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      Require Re-Register Multi Factor Authentication (MFA)

      If you have a user that is having issues logging in with MFA, Require Re-register MFA will make it so that when the user signs in next time, they will be requested to setup a new MFA authentication method.

      As an administrator assigned the Authentication Administrator or a Global Administrator role you can require users to re-register for MFA. This is a good first step when troubleshooting Multi-Factor Authentication end user issues. 

      1. Sign in to the Azure portal.
      2. On the left, select Azure Active Directory > Users > All Users
      3. Choose the user you wish to perform an action on and select Authentication Methods.
      4. Click Require re-register MFA and save.

      The user will now be prompted to setup up MFA again on next sign in.

       

      Source: https://docs.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-userdevicesettings#:~:text=