I notice the servers are always empty I figure the bug is back while it shuts off online mode to single player mode, with the amount of copies sold from GOG we should have at least bunch of servers.

I'm not sure how many people own the game but I've hardly seen anyone with co-op or invasions on. I'm pretty sure you can only see others available for co-op if they're playing the same difficulty as you and if they're using the same mods you're using. If people are playing with mods, you'll only see them available if you're using the exact same mods.

Makes sense but I notice on all difficulties no one is playing and a lot people are from Europe or across the Glob on different time zones.

Not being able to redeem dockets that are available to Steam users and the lack of cross-play have a lot to do with it. I hope that'll be different for the sequel, assuming it makes its way here.

I find that strange to why they would separate and not have the dockets, while we can log in to Techland from the main dying light menu from GOG.