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 get anxious thinking what happens if my phone got lost and how i log in if my authenticator is locked, so is there like a backup code or something?
For both Android and iOS, Authenticator App can safely backup your codes to iCloud or Google Cloud backup. You can configure it in Settings from Authenticator App.