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If you use Wayland you cannot use MS with PDS games, it must be off. It works with X.org though.
 
I have xorg but MS is still greyed out even though it works fine in other PDS titles.(EU4, HoI4 etc) It's sad because I play this game the most. Any suggestion how to fix it?
 
Not really, sorry. Has it always been like that with this game? Or it used to work?

Which distro do you use? Have you checked with any support source for it?
 
Yeah, it's always been like this on linux, but just with ck2. I use linux mint. I did some research and it seems like I'm not the only one. People are saying that MS is not supported at all for ck2 on any of linux distros. I'm a bit puzzled. I hope that steam will allow to launch windows versions of linux ports via proton, maybe then it would work.
 
I just tried this in Ubuntu and you are right, it is not available there either. It must never have worked for CK2 regardless of X.org or Wayland.

I rather doubt at this late stage in the game's life that this situation will change, I'm sorry!