Share option missing for an Apple Music playlist

I have many playlists and as far as I know, I haven't checked them all, I am able to share most of them. So far, there is one that does not have the share option. I have tried to copy it and paste it into a new playlist but, it still does not show the share option. Not all of the songs in the playlist came from Apple, and I am wondering if one of those songs is preventing me from sharing the playlist.