Our YouTube Premium purchase support team can help you with this, contact them here: https://goo.gl/m11wvR . Hope this gets resolved.
@TeamYouTube On my new Xbox One X and 4K TV, my 4k movie purchases only run at 1080p. The output settings on the Xbox are set to 4K and I can watch regular 4K YouTube videos at their native resultition. The only exception is my movie purchases. I don't have this problem with Vudupic.twitter.com/L5uvmhilvQ
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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