pfSense - Cannot assign interface to OpenVPN server

I had a working OpenVPN server and also a OpenVPN client to a VPN provider. I needed to forward a port through VPN client from VPN provider. Long story short, port forward didn’t work. I was told that I have to change OpenVPN server interface to another one. As soon as I did this port forward started working. But this time, OpenVPN server is not working on the new interface. Pls help to get OpenVPN server working on an interface other than the default OpenVPN.

My setup is as below:

What is wrong with my setup?
Thank you.

PS. As I am not allowed tu upload any link or more than 2 pics in a message, other pics will follow.