[2019] I can not connect to game in co-op mode

Hey @Imago

We’re sorry to hear you’re experiencing issues while trying to play the game cooperatively. We recently posted a thread with common technical issues and their possible solutions which has an entry that could help you with your problem.

Could you take a look at it and see if it fixed your issue? Otherwise, please let us know if you’re still unable to connect.
Thanks

That being the case, it seems it could be a port-forwarding issue. Please make sure to open for both you and your partner the following ports in your router:

UDP 27000 to 27030, UDP 3478, 4379 and 4380

How to do so depends on the brand and model of your router. Here’s a general guide on how to do so but please bear in mind that it can vary wildly depending on the model: