Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello Bev Gallant
Regarding your concern, may I confirm whether you are trying to add the Microsoft Authenticator app to a new device for your work account?
If so, and your account is currently configured to use Microsoft Authenticator for MFA, you may be asked to verify your identity using one of your existing authentication methods. For example, if you recently changed to a new phone, you may need access to your previous authentication method before you can complete the setup on the new device.
First, please try the following:
- Go to Security Info and sign in with your work account.
- If you can successfully sign in, select Add sign-in method.
- Select Microsoft Authenticator and follow the on-screen instructions to set it up on your new phone.
However, if signing in requires approval from the Microsoft Authenticator app on your old device and you no longer have access to that device, and there are no other authentication methods available, you will need assistance from your IT administrator or the administrator who manages your work account.
Please ask the administrator to reset or require re-registration of your MFA authentication methods in Microsoft Entra ID. They can refer to the following Microsoft documentation for guidance: Manage user authentication options for Microsoft Entra multifactor authentication
After your authentication methods have been reset, you should be able to sign in again and register Microsoft Authenticator on your new device. Once you regain access, I also recommend adding an additional authentication method, if your organization's policies allow it. This can provide another way to verify your identity if Microsoft Authenticator or your device becomes unavailable in the future.
Otherwise, if you are the only user or administrator of the tenant, you will need to contact the Microsoft Support Data Protection team to have your MFA reset. Please locate the appropriate Microsoft support hotline and contact the frontline support team so they can raise a ticket on your behalf: Customer service phone numbers - Microsoft Support
*Please note that this is a user-to-user support forum. Only Data Protection team can help you to revoke the session and reset your password, account, MFA...
Data Protection Team will first verify your ownership of the account and revoke your MFA once confirmed. After that, you can set up the Microsoft Authenticator app again on your new device.
Feel free to let me know if there are any updates or if you have further questions regarding this issue.