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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Apparently I had to manually back up my authenticator app before switching phones?! I did not do this and now I cannot log into my work or school accounts. HELP!
I am seeing this exact same issue with no means to resolve the problem. Called MS support line and they wanted to connect to my computer for a problem with my phone.