Thanks for your help, I tried UDP port 15797 as well and had the same issue.
What do mean that the UDP may be causing the issue? What kind of workaround did you have in mind — TDP?
Can I run a traceroute or pull something from the router’s logs that would help you see why the router won’t pass internet over this connection?
Appears to be the same issue as this other thread, with the router showing as a connected client but no internet connection a minuscule amount of download data (link).
PiVPN is almost certainly the easiest way to set up a personal Wireguard server on any Linux machine, including a Raspberry Pi. I think it makes a lot of sense for GL.iNET to support it out of the box — or with minimal modifications that we can document here in the forums. As I mentioned in the first post, several others have had issues getting GL.iNET to play nice — this is definitely something that people are buying these routers for.
PiVPN Github (link).