I've made a Christmas playlist, then made it collaborative with my wife. We both have a Premium account (Family) and add christmas songs we like to that playlist.
We've both set up our Google accounts with voice match on Google Home, so it knows who's speaking, and we've also both linked our respective Spotify accounts and set Spotify as default music service provider.
She's able to start playing her own playlists by voice control, as I am - but I'm the only one who can start playing our collaborative playlist. When my wife wants to play it she has to start it from the Spotify app, it can't find the list by voice?