**BUMP**
Yes, I am having this same issue. I've tried overriding the maximum players allowed in a company, using the same command from Ark, MaxNumberOfPlayersInTribe=<value> under both the game.ini, and defaultgame.ini files in the server config with no luck.
I am not sure why it is not working. If anyone has a solution to this issue on unofficial servers that would be great to know.