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Microsoft Security | 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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If you have access to the old device, ensure you back up first.
Reference: https://support.microsoft.com/en-us/account-billing/back-up-your-accounts-in-microsoft-authenticator-bb939936-7a8d-4e88-bc43-49bc1a700a40
Then on the new device-Install Authenticator and sign in with the same Microsoft account. Tap Restore from backup.
Reference: https://support.microsoft.com/en-us/account-billing/restore-account-credentials-from-microsoft-authenticator-ce53096e-1e1c-4840-9e32-1618bc33cd43
If You No Longer Have Access to the Old Device or are unable to operate it, you’ll need to reset your authentication method. Go to https://account.live.com/password/reset or contact your organization's admin. Admins can reset MFA via Microsoft Entra Admin Center. [learn.microsoft.com].