Audio sharing does not work no sound transmitter to participants

[iNNerControl]

I have many sessions with audio for my work, but since today, Zoom suddenly isn't transmitting sound to participants anymore. They can hear my voice, but no matter which option I choose (and yes, the 'share sound' option is enabled), they don't hear the music, or they hear it extremely softly (which might actually be my own sound reflecting through the microphone). I have no idea how to solve this. Can someone help? I can hear the music just fine on the PC I'm streaming from, so it seems like it's something within Zoom itself that isn't working anymore.

It's very strange that there isn't a way to report technical issues directly to Zoom because if this is a Zoom issue, it needs an urgent solution.