2FA using the TOTP method is mandatory for all users on GateHub.
You will need to use or install a 2FA application (like Google Authenticator, Authy or Duo), add GateHub to the application by scanning the QR code or entering the Authentication key. Your app will generate a new code that you use to finish the 2FA setup.
Please follow the instructions on our support page: How to enable 2FA?