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The Microsoft Authenticator is a software-based tool created by Microsoft Corporation to allow for multi-factor authentication and authentication to Microsoft accounts without entering a password. The Microsoft Authenticator uses time-based one-time password authentication with sites and apps to authenticate a user to an account.

When logging into a Microsoft account the Microsoft Authenticator can use a fingerprint, pin, or facial recognition to login to the account. This allows users of Microsoft based accounts to login to the account without having to enter passwords.

When logging into a non-Microsoft based account the Microsoft Authenticator application can be used for multi-factor or two-factor authentication. The Microsoft Authenticator can have a push sent to their device, or a one-time password that gets generated by the app can be entered into the site when logging in.

The Microsoft Authenticator is available on Android and iOS.

Use Cases
The Microsoft Authenticator will be used with different sites and applications to offer multi-factor authentication or with Microsoft applications using your phone instead of a password.

When working with Microsoft applications login to your account, open the Microsoft Authenticator application on your device and approve the notification, and then configure your pin, fingerprint, or facial recognition to sign into the application.

You can configure your accounts for multi-factor authentication which allows you to configure your account and the application to produce six randomly generated numbers to put in for further authentication.

When working with non-Microsoft applications or sites, the steps will depend on the site or application.

Technical Details
The Microsoft Authenticator utilizes the industry standard for time-based one time password authentication. The beta for Microsoft Authenticator started in June 2016