Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
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I have just gotten a new phone and my app won’t work anymore even though I’m signed in, so now when a Microsoft app ask me to put in the number so I can log in it won’t let me.
Reinstall the Microsoft Authenticator app on your new device.
After reinstalling the app, you'll need to re-add your accounts to Microsoft Authenticator. This typically involves scanning a QR code or entering a code provided by the service you're trying to authenticate with.