Locked out of Authenticator

If you're stuck in an endless loop trying to sign in to the Microsoft Authenticator app and have exhausted all troubleshooting options, here are some steps you can take:

1. Alternative Authentication Methods: Check if you have any alternative authentication methods set up, such as SMS or email. You might be able to use those to regain access.
2. Contact Microsoft Support: If you are the sole administrator of your account, it’s advisable to contact Microsoft’s Data Protection team. They can assist you in verifying your identity and help you regain access to your account.
3. Different Device: If possible, try installing the Authenticator app on another device to see if you can log in from there.
4. Trial Tenant: As a last resort, consider creating a trial Microsoft 365 tenant. This will allow you to submit a support ticket directly from that tenant, explaining your issue in detail.

These steps may help you resolve the issue and regain access to your account.

References:

• I have a Micrsoft business account and I am the admin and the only user registered under this account. I can't log in because i have replaced my phone and the authenticator doesn't work. - Microsoft Q&A
• Locked out of global admin account (MFA) - business down - Microsoft Q&A