Account security
Protect your dashboard. Email one-time codes are required at sign-in unless you enable an authenticator app (then TOTP is used instead).
Authenticator app (TOTP)
Use Google Authenticator, 1Password, Authy, or any app that supports TOTP.
Email one-time codes
Receive a 6-digit code at your account email when signing in. You can use this alone or together with an authenticator app.