No sound when sharing video. Sometimes

This is how my colleague fixed it: He went into Sounds settings on computer, Advanced, and changed to headset from Default for Chrome. I also had him uncheck the Sync buttons on headset option in Zoom settings.

I see a lot of attempted solutions here and elsewhere on the web. They either don't work or, as often as not, the steps I'm told to follow don't even appear in the settings. Could depend on the Windows or Zoom or Chrome version or something else. I had this problem and I found two things that worked, if it helps anyone.  Both of them are workarounds, which are usually complicated. When sharing the screen, my video would play with either no sound, very faint sound or speech only, no music or sound fx, which would indicate some kind of background noise elimination. Fixing that didn't help. The two solutions that worked were:

1. A folder or some location to play the video from outside Zoom, or

2. Click on the up arrow next to the audio button on the toolbar and click on Leave Computer Audio. The video sound will play but your microphone will be muted. You have to click Join Audio to resume using your mic. You can't have video sound and your mic at the same time. It's cumbersome but it works. Hope this helps.