bought on xbox store cant play on pc?

so i bought the game on xbox store for both xbox and PC as you can normally play on both, after trying to play on the xbox and seeing how laggy it is and just in general how slow it was on a fresh park i wanted to try my PC but it just doesnt show in my library or the store at all. anyone know if you can play on both devices or shall i refund it and buy it on pc?
 
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