Yes.. Open VPN can be a pain in the backside for those who do not have technical knowledge.
Prior to this.. I used the OpenVPN AS version on a Linux Ubuntu 16 via Google Cloud Compute. Many things work if you just want a Single User ie Device to connect but if you are a bugger like me who program the OpenVPN client in Merlin interface, aiyayah.. It's a real bother.
First off, Open VPN AS works for Devices only.
If you using a frigging router.. then UR screwed.
U will need many tools.. like a way to SIGN YOUR OWN CERTS
I played cheat.. and installed Windows 2008 Server and used it as my signing certificate.