Sign in using Microsoft Authenticator - Microsoft Support Microsoft Authenticator helps you sign in to your accounts if you've forgotten your password, use two-step verification or multi-factor authentication, or have gone passwordless on your account
Microsoft Authenticator FAQs - Microsoft Support When App Lock is enabled, you'll be asked to authenticate using your device PIN or biometric every time you open Authenticator App Lock also helps ensure that you're the only one who can approve notifications by prompting for your PIN or biometric any time you approve a sign-in notification