Two-factor sign-in is optional. With it on, signing in needs your password and a code from an authenticator app on your phone, so a leaked password alone can't get into your account.
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Two-factor is off
You'll need an authenticator app, such as Google Authenticator, 1Password or Authy.
Scan this with your app
Can't scan it? Type this key into the app instead:
Save your backup codes
If you lose your phone, each of these signs you in once. They won't be shown again, so keep them somewhere safe, like a password manager or a printout.