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Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
5,538 questions
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I'm sorry to hear that you formatted your phone without backing up your Microsoft Authenticator data. Unfortunately, there's no way to recover the lost data within the app itself if you didn't have a backup enabled.
See also:
Back up and recover account credentials in the Authenticator app