Hey @GooglePlayMusic users 
Starting today, you can seamlessly transfer your audio library and personal taste preferences to #YouTubeMusic with a single click. Access is rolling out now, welcome to your new home for music. More info here → https://yt.be/NJiv pic.twitter.com/9mnLTT0Z3p
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No that doesn't fix a thing.. it seems that it's a common issue that you aren't able to create or see playlists in the YouTube Music app.. you can create a new playlist in the app, but you cant see it or add music to it.. the new playlist WILL show up in the regular YouTube app..
Sorry to hear you're still having trouble – mind sending in a report about your experience from the YouTube Music app? Just click on your profile photo > Send feedback. While you may not get response, we do use the details to help us investigate and fix issues.