Hey there,
Same issue here, Grim Dawn is no more available on the French Xbox store although it still is on the US store.
I don’t know what’s going on, I also thought about the future expansion but it doesn’t make sense… Searching for grim dawn on the store returns nothing and when you get to the game’s page from a Google search the purchase button has been deactivated and replaced by a message “not available separately” 
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