Give it time MS are changing the way it works on PC so it will eventually work with 3rd party launchers. Bethesda games like Fallout 4 work on game passI'm not so sure... Game Pass uses Windows Store which AFAIK doesn't let you launch other software from an app downloaded from it. e.g. You can't install Rockstar Social Club/Games Launcher as part of a download from Windows Store. I think that's why it's not available to PC. On Xbox, you sign in to RSC from within the game, on PC it's via the extra client.
