Hi there. Our Premium support team can dive into this further with you, contact them here: https://goo.gl/m11wvR . Hope this gets resolved.
@TeamYouTube hi! I buyed YouTube premium and it worked fine, but after a while I could not play the video in the background. In settings it is set on and I am sure that I have the right account, because every thing else works. I have a IPhone XS Max
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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