Hello @Sharon01,
Thank you for posting your query on Microsoft Q&A.
Based on your description, it seems that you're trying to add an additional authentication method in Entra, but for some users, the Microsoft Authenticator appears under "Non-usable authentication methods." You would like to move it to the "Usable authentication methods" section. Below is a screenshot from my test tenant for reference.
Cause: This occurs if users did not complete the setup or failed to verify the 2-digit number that appears after scanning the QR code in the Authenticator app during MFA setup.
After scanning the QR code in the Microsoft Authenticator app, when users click "Next" on the setup page, they will be prompted with a 2-digit number to verify the registration.
If the user does not verify the registration and, for some reason, returns to the previous page or skips the MFA setup with the Microsoft Authenticator app, it will appear under the "Non-usable authentication methods" tab in the user's profile.
Solution: To move it to the "Usable" section, you can require the affected users to re-register for multi-factor authentication. For this, click on "Require re-register multifactor authentication" for all users whose methods are listed under "Non-usable authentication methods." On their next sign-in, they will be prompted to re-register for MFA, or they can visit aka.ms/mfasetup to complete the setup using the Microsoft Authenticator app.
I hope this information is helpful. Please feel free to reach out if you have any further questions.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Thanks,
Raja Pothuraju.