Single AudioSource "Ran out of virtual channels" WebGL

I have a tiny 2D project and for couple of days I've been trying to get it to work properly in the browser. It has one AudioSource playing one sound, yet it does not play it. According to browser console it:

• Ran out of virtual channels

• FMOD returns error code 10 (FMOD_ERR_CHANNEL_ALLOC) executing playSound

• FMOD returns error code 10 (r) executing playSound

I already got rid of an "needs to be resumed" problem with some hacky FixAudio.jslib and hoped I'm close to having some sounds in this simple project created in state of the art game engine (2020.2). I hope it's a simple fix and someone will soon help me figure it out. Otherwise why is building to WebGL even an option in build settings?