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Microsoft Security | 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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If you're trying to sign in to the Authenticator app and it's asking for a code from the same app, try signing in from a web browser and see if you can reset your verification method or add another sign-in option. If you still can't get in, your Microsoft 365 admin or Microsoft Support may need to help reset your MFA.