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...
This is an absolute must! Since this is currently only possible in the v1 MSOnline module and since that module does not support authentication using an app registration, once basic auth goes away, this will no longer be possible to automate.