I'm running openvpn-as v2.13.1 on Ubuntu 20.04.6 LTS on an RPI3B+, and I can't get any pings to the server via mobile data. It's not a port forwarding issue; I can access the VPN gateway by going to my public IP address without specifying a port when connected to wifi. As far as I can see, the problem is not with the firewall. I have other ports forwarded, and I can access them both within and outside of the local network.
I did enter my public IP address into the admin UI under setup -> network settings -> hostname or IP addresses.
This is my third clean install; the first time it worked on the same hardware, Ubuntu 22.04 LTS with a docker image, but for some reason (something about twistd PID 1), it never restarts properly. It didn't work on my second installation of 22.04, so I'm trying again on 20.04.
If someone could assist me in getting it up and going, it would be greatly appreciated!