Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
5,954 questions
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I'm trying to sign in to my work email. They asked me to use my authentication app, but I have a new phone so I'm not signed in to it. Every time I try, it signs me in. It says that I have to use the authentication app, which I don't have or am not signed in to.