The device on which the Microsoft Authenticator app is installed must be registered within the Azure AD tenant to an individual user.
Latest version of Microsoft Authenticator installed on devices running iOS 8.0 or greater, or Android 6.0 or greater.
The Authenticator app automatically generates codes when set up to do push notifications so a user has a backup sign-in method even if their device doesn't have connectivity. Push notifications to your smartphone or tablet help the Authenticator app to prevent unauthorized access to accounts and stop fraudulent transactions.
Recommended: Azure AD Multi-Factor Authentication, with push notifications allowed as a verification method.
To use passwordless phone sign-in with the Microsoft Authenticator app, the following prerequisites must be met:
Type the number they see on the login screen into the Microsoft Authenticator app dialog.
To complete the sign-in process in the app, a user must next take the following actions: People who enabled phone sign-in from the Microsoft Authenticator app see a message that asks them to tap a number in their app. This technology can also be used with any app or website that integrates with Microsoft Authentication Libraries. This authentication technology can be used on any device platform, including mobile. Windows Hello for Business uses a similar technology. Microsoft Authenticator uses key-based authentication to enable a user credential that is tied to a device, where the device uses a PIN or biometric. The Microsoft Authenticator app can be used to sign in to any Azure AD account without using a password.
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