Can't connect to Wireguard Server

Can you confirm you’re able to dig your DDNS & the correct Public Internet/WAN IP?

It might be related to a ‘kill switch’ via Global Options/Proxy but I’m just speculating.

Here’s a example of a ‘pure’ WG Server → WG Client using two GL devices all on the same subnet. If you can model based on that, it should just be a matter of then adding the GL DDNS string back into the confs: