Game Pass Ultimate and Steam

They are playing on PC as well and with Game Pass Ultimate. I have Game Pass Ultimate and the game downloaded but cannot play with them because I did not download through the Microsoft Store?

As far as I am aware, there is no cross platform play between Steam and Xbox when it comes to Ark, so your Steam version cannot communicate with their Game Pass version of the game. You would have to download the Game Pass version of the game and start fresh
there in order to play with other people using the Game Pass version.

It would still be the Standard. The Ultimate Edition is the edition you get through Game Pass, and to use that, you would have to use the Xbox App on Windows 10. Steam would only authorize the standard edition content, not the Ultimate edition, if that
is what was purchased. The account wouldn't pull in/authorize the Game Pass Ultimate content to the non-Game Pass title.

ok your not under standing what i said, sorry...

i bought pc Ultimate game pass, then i bought fallout 76 on pc Ultimate game pass.

fallout 76 is free, on steam and bethesda.net, it is the account you pay for.

You would not get the rewards of Ultimate Edition playing on Steam unless you purchased the Ultimate Edition on Steam. The Game Pass subscription would include that, but if you were to upgrade or play on an Xbox One console, it would have the Ultimate
edition content, as well as your profile progress from the other copy and multiplayer.

no, you'll have to get the pc games from the microsoft store.