I have gamepass for PC and i'm playing the game right now. You don't need Ultimate, you just need to download the Xbox app and all the games are there for you. The Microsoft store has nothing to do with Gamepass, there you can buy the game and that's it.
Same here, I have standard Gamepass on PC, works fine for me.
XBOX game pass fraud? no: microsoft store region problems
in Grounded: General Discussion (NO SPOILERS)
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Same here, I have standard Gamepass on PC, works fine for me.