From now on, signing in needs a code from an app on your phone as well as your password.

1. Install Google Authenticator or Microsoft Authenticator on your phone.
2. In the app, tap + and scan this code.

On this phone? Open it in your authenticator app

Can't scan? Choose "Enter a setup key" in the app and type this key.

3. Type the 6-digit code the app now shows.