How can I change or add a phone number using my active device?
Note: It is highly recommended to have the Microsoft Authenticator app installed on your phone to avoid delays. You can only change or add a phone number if you had originally activated the Microsoft Authenticator app or have access to the old phone number.
Tip: Turn on Cloud Backup and recover your Microsoft Authenticator app settings when you get change your phone number or get a new device.
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