
To remove the number, you would have to change the default sign-in method, then remove the phone number again.

You can't remove a phone number that is in use as the default sign-in method. Tried multiple mobile numbers (including different providers), office numbers, and the authenticator app. Reset MFA via 'Require Re-register MFA' 3). When prompted to confirm the action, select OK. Ensured that the sign-in isnt blocked (and have also tried enabling/disabling to see if that helped - it didnt). Point your camera at the QR code or follow the instructions provided in your account settings. To delete the phone number, select Delete on the SMS sign-in phone method tile. Set up the Authenticator app After you install the Authenticator app, follow the steps below to add your account: Open the Authenticator app. When SMS sign-in is available, a banner is displayed asking if you'd like to enable the phone number for SMS sign-in:Īlso, an Enable button appears if you select the caret on the phone method tile.

If you are already using a phone number with an organization, and using your phone number as a user name becomes available, the following steps can help you sign in. Reach out to your admin to fix the problem. If you try to use a phone number that someone else in your organization is using, you'll see the following message: You'll have to sign in with the added number and then follow the prompts to register the number for SMS sign-in.

Important: Due to a known issue, for a short time adding a phone number will not register the number for SMS sign-in.
