Have you confirmed mydomain.net is resolving to the proper IP or at all? If you're able to directly browse to the service via its IP:port (I assume port 8282 is the actual container not your reverse proxy), have you confirmed you're tcp/443 is being allowed to your docker server on your wireguard interface? First thing I would try is connecting to wireguard and doing an nslookup for mydomain.net and confirming the correct IP resolves. Then check that tcp/443 to the container is being allowed through on your wireguard interface.