This content is intended for users. If you're an administrator, you can find more information about how to set up and manage your Azure Active Directory (Azure AD) authentication environment in the administrative documentation for Azure Active Directory.
If you're having issues signing in to your account, see When you can't sign in to your Microsoft account for help. Also, you can get more info about what to do when you receive the “That Microsoft account doesn't exist” message when you try to sign in to your Microsoft account.
The Microsoft Authenticator app helps you sign in to your accounts when you're using two-factor verification. Two-factor verification helps you to use your accounts more securely because passwords can be forgotten, stolen, or compromised. Two-factor verification uses a second factor like your phone to make it harder for other people to break in to your account. You can use the Microsoft Authenticator app in multiple ways:
Two-factor verification. The standard verification method, where one of the factors is your password. After you sign in using your username and password, you can either 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.
Code generation. As a code generator for any other accounts that support authenticator apps.
Authenticator works with any account that uses two-factor verification and supports the time-based one-time password (TOTP) standards.
Your organization might require you to use the Authenticator app to sign in and access your organization's data and documents. Even if your user name appears in the app, the account isn't set up as a verification method until you complete the registration. For more information, see Add your work or school account.
Download and install the app
Install the latest version of the Microsoft Authenticator app, based on your operating system:
Google Android. On your Android device, go to Google Play to download and install the Microsoft Authenticator app.
Apple iOS. On your Apple iOS device, go to the App Store to download and install the Microsoft Authenticator app.
Important: If you're not currently on your mobile device, you can still get the Microsoft Authenticator app if you send yourself a download link from the Microsoft Authenticator page.
Set up security info to use text messaging (SMS). Enter your mobile device number and get a text a code you'll use for two-step verification or password reset.
Set up security info to use phone calls. Enter your mobile device number and get a phone call for two-step verification or password reset.