If you've turned on 2-Step Verification and are trying to sign in to your Google Account through a device, mobile app, or desktop app, you'll need to enter an App Password.
You'll need to create a different App Password for each device or application you'd like to use with your Google Account.
If you're having trouble using an App Password on your phone:
- On your phone's browser, go to https://accounts.google.com/DisplayUnlockCaptcha.
- Enter your username and password, then enter the letters on the screen.
- Go back to the application you're trying to access and enter your App Password.