FOXxTITAN

So ? Did this post are going to be ghosted like on Steam and Microsoft support ?

Hi I really need help, I can't find a solution to this problem nowhere. I was able to play Grounded in cross-play with my friend before the full game release but it's no longer possible since. I have the game on Steam and him via Game pass, we cannot see eachother in our In-Game friend-List when creat a lobby, but we can see eachother in our Friend-list of the Xbox game bar. When my friend send me an invite from the Xbox game Bar, it brought me back to Grounded main menu and a Windows's pop up appear and say that "You'll need a new app to open this link ms-xbl-multiplayer", with a link that say "Find an app in the microsoft store" that brought me in the official Grounded microsoft store page to propose me to buy the game again or take the Game pass.... I've never find this "app" I need to open this "ms-xbl-multiplayer" (???), And it's seems that internet have not the solution either. So I would like to know what i'm suppose to do for playing again with my friend, please.