If you have a user that is having issues logging in with MFA, Require Re-register MFAwill 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.
See Also
How to find which MFA method is applied/assigned on users in Azure AD? Is there a way to check and get the report via PowerShell or GUI? - Microsoft Q&AHow to Check if All Azure Users Have MFA EnabledEnabling MFA for password reset and account unlockConfigure the MFA registration policy - Microsoft Entra ID Protection- Sign in to the Azure portal.
- On the left, select Azure Active Directory > Users > All Users
- Choose the user you wish to perform an action on and select Authentication Methods.
- Click Require re-register MFA and save.
The user will now be prompted to setup up MFA again on next sign in.
