I'm facing the same issue. From what I've noticed, the MusicItemID of a library song is different from an album song, and the player cannot play it. The same goes in the case of a library album. If I get the id of the library song and send another request to - https://api.music.apple.com/v1/me/library/songs/{id}/catalog And then set it to the queue; it works fine. Hoping for a fix soon!

I'm facing the same issue using the ApplicationMusicPlayer. It there a solution to this?