I’m trying to SharePlay with some friends via Spotify, but they don’t see an option to SharePlay anything.

They have a subscription to the app (Spotify), and their devices are all up to date (iOS 15.1), but when they click on FaceTime in Settings, the option to turn on SharePlay isn’t even an option. Did the option for SharePlay only go to some devices? I also had the same problem with some friends with the background blur. Tried helping them out with that also, but there was no option for that either.