I just fixed it!!!!
After 3 weeks of not being able to hear my students on my laptop ZOOM session (had to join with a different Zoom account on my phone for audio, while using my laptop for video/screen sharing -- such a pain), I finally got my laptop speakers working in Zoom!
Here's how:
While the Zoom meeting is open, go to Settings, open Sound settings---in that menu open Advanced Sound Options: "App Volume and Device Preferences". If you do this when NOT in a meeting, you will get volume adjustment bars for your speakers (master sound) and your computer sounds (systems sounds). BUT, if you open this while in a ZOOM meeting you also get volume adjustment bars for ZOOM meetings. Mine were muted. All I had to do was turn them back on and all of a sudden I could hear everyone again.
Hope this works for you.
Lori