how to Unlock authenticator

To unlock Microsoft Authenticator on an iPhone when it stays locked after entering the iPhone passcode, the documented resolution is:

1. Delete the Microsoft Authenticator app from the iPhone.
2. Reinstall Microsoft Authenticator from the Apple App Store.
3. Open the app and set it up again with the required accounts and sign-in methods.

If access to accounts is lost because the app was removed or the phone was changed/reset, the MFA methods may need to be reset by a tenant/global admin or via Microsoft support, as shown in similar recovery cases in the context.

References:

• Cannot unlock the Autheticator - Microsoft Q&A
• Download Microsoft Authenticator
• I need to reset my mfa methods - Microsoft Q&A
• Requesting a Tenant Admin MFA Reset - Microsoft Q&A