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 have set on all domain user accounts MULTI-FACTOR AUTH to ON, where the user is required to provide an SMS code when logging into Office365, such a state is ideal for me, unfortunately MS has automatically started to force users to provide additional authentication with a mobile app despite the fact that no administrator has not changed these settings - for what MS automatically changes the authentication method?