Impossible to play (uknow error)

[侍Ronin]

I have been wanting to play the game with my brother for several weeks now, we each have our Steam account and original copy. But when we want to join the same lobby: 1- it comes out unknown error 2- one disappears from the lobby after accepting the invitation 3- it kicks us out of the game.

We are connected to the same network, but even putting in launch options a different port for each team still happens the same thing. Would anyone know of another solution?

PD: We have a very good connection, we each use an ethernet cable.

[Juzi the Shark]

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