Apple Music sharing

Recently, I bought a new iPad, and I received Apple TV+ and Apple Arcade free for 3 months. I also subscribed to iCloud+ and enabled it for my wife. She also received Apple TV+ and Apple Arcade. However, I now have 6 months of free Apple Music, but it's not shared with the family. I'm unable to understand why the other two subscriptions were automatically shared with the family while Apple Music is not.