A moderator has requested we make *another* thread regarding this issue , after Spotify responded to the previous thread with "this is the expected behaviour".
Here is the link to the original thread:
Two weeks ago it was possible to control your Xbox Spotify volume through another device (Android, iPhone, PC, Mac all worked)
Two weeks ago this stopped working, which causes a major issue for Xbox users as the lowest setting you can set Spotify at on Xbox is incredibly loud and you can't actually listen to music while gaming without being completely deafened.
I appreciate that we now know this was "the expected behaviour" so this whole new thread has to be made just to report that this needs to be rolled back / changed as it only has negative implications and anyone can see it should not work this way.
Sadly we have been told to make a whole new thread and I'm guessing wait another two weeks for their next response.