I'm a long time user of Spotify.
I'm currently using Windows 10 to run Spotify and I'm using the desktop version.
A few days ago, I stopped getting any sound out of Spotify
I first checked if it was muted, but it wasn't, the sound was at the max setting
Then I checked the Volume Mixer:
Also, without any visible problem.
Note that if I use Spotify web player, everything works and all the apps that use this sound output are working without any problem (teams, chrome, system, skype, etc).