Re-registration When Renewing Smartphone
If you've registered your MFA information using only a smartphone app like Microsoft Authenticator, switching to a new phone might prevent you from authenticating. If you're unable to authenticate, please follow the steps below. However, if you registered your phone number as MFA information before switching devices and the number hasn't changed, you should still be able to log in normally.
When only a smartphone app is registered with MFA information
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Register your phone number as an alternative to the app for authentication. See the page below for instructions.
Phone Number Setup for Sign-in Issues -
Access https://mysignins.microsoft.com/security-info on your new mobile device (smartphone or tablet).
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When the screen shown below appears, click “I can’t use my Microsoft Authencicator app right now”.
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The phone number registered in the previous step will be displayed, so select “Text” or “Call”.
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After signing in to Microsoft 365, please delete the old information. Click “Delete” on the right side of the information you want to remove.
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Install and set up the authentication app on your new mobile device. Please refer to the following page for instructions:
When your phone number is also registered with MFA information
Please follow steps 2 and onward in the section ‘When only a smartphone app is registered with MFA information’.