Thank you for posting your question in Microsoft Q&A Community.
I really understand how inconvenient this situation must be. I am very sorry for the difficult time you have been through so far.
There are a few options you can try that can help you regain access to your account, even if the Authenticator app isn't working. Note that these options come with certain conditions:
- Try signing in to this link: Office with your work/school account on a different browser or device:
Sometimes, browser settings or cached data can interfere with the login process. Try signing in with a different browser (such as Edge, Chrome, or Firefox) or another device to see if the sign-in options appear differently.
- Use another login option:
When you try to log in, look for the "Login Options" link.
If your phone number was previously registered to your account, you may be able to choose to receive a verification code via SMS or phone call instead of using the Authenticator app.
If you don't see this option, your account may be set to use only the Authenticator app.
- Contact your IT admin to reset your MFA through the Microsoft Entra admin center:
If none of the above steps work, ask your administrator to follow Microsoft's official instructions for resetting your MFA settings:
Sign in to the Microsoft 365 admin center as an authentication admin at a minimum
Go to Identity > Users > All Users
Select your account, then click Authentication methods
Choose: Revoke Multi-Factor Authentication Sessions, and then click Require Multi-Factor Authentication to Re-Register.
This will disable all previous authentication methods and prompt you to set up a new one the next time you log in, allowing you to register a new application or authentication method.
I hope my information helps. Please feel free to contact us again if something doesn't go right or if you need further assistance.
We look forward to hearing from you.
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