Two-factor authentication (also known as 2FA or Multi-Factor authentication or MFA) is a way to increase login security.
Once 2FA has been enabled on the VPN gateway, VPN Tracker will automatically respond to the request when connecting:
Most VPN connections will automatically prompt you to enter your 2FA code in a separate step after the username and password have been verified.
In some cases, you may need to add your 2FA code directly after your regular password. There's an option under Configure > Advanced to tell VPN Tracker to always prompt you for the XAUTH username and password dialog, instead of attempting to automatically sign in with your saved credentials.