All Multiplayer Games "Incompatible"

So I got Homeworld Remastered Multiplayer Beta, but all the games are labeled “Incompatible.” I have no mods installed, and I did a test with my friends to try to join their game with no mods and it told me I was missing the “Homeworld Remastered Compatibility Archive” or something like that. I have no idea how to fix this. Please help.

Bumpin for answer friend and i have this same problem

Were you on the Beta before we launched? Or did you buy the game on Steam, at/after launch?

Seems like it might be a good idea to have steam do a file integrity check, and doublecheck that the “DLC” campaign downloads are checked? Just guessing though.