Why don’t I even have the option to turn iCloud music on?

I have an iPhone 6s, and I have family sharing on. When I went to turn in a playlist on the other iTunes account, I didn’t have any playlists and then I looked around, and had only some of the music. I went to music in settings, and the iCloud music toggle was there but it went away after a second and hasn’t come back. I have reset my phone and looked around, but no one else seem to be having the same problem