Click Security info on the left side of your screen. Sign in to your Microsoft work/school account () on your computer. To add your new phone to your Microsoft profile, you need to access and edit your Microsoft work/school account profile. Updating your Microsoft Profileīecause this app ties itself to a specific device, you can’t simply install the app on your new phone or tablet and expect it to work. If you can't, you have to submit a request by opening a ticket to have your MFA reset. What happens when you purchase a new phone and no longer have the old one? If you have access to a computer, you may be able to update your MFA configuration to include your new phone following steps outlined below. 
Selecting Microsoft Authenticator app as a primary second factor authentication method during the initial MFA setup have posed a big challenge to users that did not configure any alternate authentication methods. This option requires you to have access to a phone that you used and registered with Microsoft during MFA setup, in order to complete the MFA challenge when signing in.
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