https://studylib.net/doc/27639687/how-to-set-up-google-auth-and-openvpn-v1
OpenVPN Setup Guide: Install & Configure with Google Authenticator
Step-by-step guide to install and configure OpenVPN with Google Authenticator for secure VPN connections on Windows and Mac. Includes troubleshooting support.
openvpn setup guidewith googleinstallconfigureauthenticator