First, you must download Microsoft Authenticator and register your Office 365 account within Microsoft Authenticator:


  1. Browse to https://aka.ms/mysecurityinfo.
  2. Sign in, then add the Authenticator app by selecting Add method > Authenticator app, then Add Method.
  3. Follow the instructions to install and configure the Microsoft Authenticator app on your device.
  4. Select Done to complete Authenticator configuration.
  5. In Microsoft Authenticator, choose Enable phone sign-in from the drop-down menu for the account registered.
  6. Follow the instructions in the app to finish registering the account for passwordless phone sign-in. Note that you may be required to change some settings on your phone for this to work. For example: if you don't have a passcode lock on your phone, you'll be required to enable it.