If users cannot access any other options other than the Authenticator App regarding MFA, then do the following:
* Add User to group 'MFA Authentication - Non APP' in M365 Admin Center, Active Teams & Groupa
* Follow this link which takes you to the MFA Page: Authentication methods - Microsoft Azure
* Click on - User Registration details (Left panel)
* Click on - MFA Status (Manage MFA Authentication Methods)
* Click on - Require re-register Multifactor Authentication
User should now be able to re-register using SMS, or phone call.
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