I found a solution;

It turns out there's this thing called port triggering which I hadn't heard about, but you need to add rules in there as well (using the same ports and IP etc.). So if you're having the same problems I had, try looking for port triggering as well. Thanks anyway Soushi

Hi, so me and my friend recently bought this game together on steam but we couldn't find each other's servers on the "Join Server" tab. We thought this was due to port forwarding, so I opened both the 27016 and 27015 ports but still nothing. I tried launching the DedicatedServer executable in the ga...