This application uses 2 security features: -Two-factor verification. The standard verification method, where one of the factors is your password. After you sign in to a device, app, or site using your username and password, you can use Microsoft Authenticator to approve a notification or enter a provided verification code. -Phone sign-in. A version of two-factor verification that lets you sign in without requiring a password, using your username and your mobile device with your fingerprint, face, or PIN.