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 disabled Authenticator app from my tenant so that I can be logging in using my phone number, but now I don’t get the verification code to login to my tenant. Even if I do, I always get a message to download Authenticator app. Meanwhile Authenticator app is downloaded on my phone already.
Did you try to reset MFA registration on your impacted account from Azure portal?
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