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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Dear team
My device are stolen my new device install microsoft authentication app but can’t work kindly relive and guide
Hi,
You need to add the new device to your account, and then you can remove the old one. When you are signed in you can go to this link and remove the old one.
https://mysignins.microsoft.com/security-info
If you are blocked on sign-ins because you don't have your old device, you need to reach out to your administrator to ask them to reset your MFA on your account.