Not sure if this is the right place… but i will try anyways…
Today i went for the first time to volumio beta ( version 3.101 ) on raspberry pi 4…
basically all i need to work is working. ( Spotify Connect, Qobuz, Youtube And Snapcast )
I also installed Spotify as normal plugin… installation went fine… login went fine the only thing there is now sound comming out… now i understand there is no support yet for plugins… but maybe someone already tried this and found a solution… if this plugin will also work i would have everything i need from this sytem… So far all is looking good 
Kind regards and keep up the good work… Love volumio… ))