I just enable Google Authenticator and started the server. Then Import my profile to OpenVPN client in Android device. When i start connect asking username and password (ticked to save password). I added user name and password (pin+Google OTP). Then Connection is success. Then i manually disconnected the client, and Reconnect again. At the time i got prmpt asking for Pin (Multi-Factor authentication). I entered Google Authenticator OTP and i got the message auth failed. So is it a limitation? or what kind of OTP i need to type in ?