Family subscriptions on family setup watch
I have an iPhone 14 and an Apple Watch. My son has an Apple Watch SE that is set up under my iPhone as a second watch. Family sharing is active on the phone and the watch and I have a family subscription to Apple Music. I can not add any music to my son's watch. There is no menu item for music on his managed watch page on the phone, and when I try to add music via the watch, it says a subscription is required, which I have. On my phone it says that music is shared with his Apple ID, but on his watch, it says he has no subscriptions.
Apple Watch SE