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I have receive an answer by gog support today:


The GOG version of Offworld Trading Company does not support custom lobbies and multiplayer is ranked only.
The ranked mode should be accessible again, please make sure that the Galaxy Client updated the game.

I can convert your purchase to GOG Wallet funds or issue a refund since it lacks some of the multiplayer functionality.
Please inform your friends that they can also ask for a refund if they are not satisfied with the multiplayer functionality.

Genoan Support

Conclusion no coop on GOG
This is extremely upsetting to me. Co-op was the main reason why I jumped on the deal last week of getting 2 copies. If I had known this before purchasing I would have never bought it.