Currently, "Require re-register MFA" can only be set https://docs.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-userdevicesettings#manage-user-authentication-options, or via Pow...
It appears that Microsoft has released a new Entra PowerShell module that uses Graph API. There's this command:
Reset-EntraStrongAuthenticationMethodByUpn
However, it doesn't seem to do anything. Anyone had any luck with that?