Audio not working when sharing video or music such as Spotify

[PeterVaut]

Can't find an answer anywhere here, so asking the community.

I have been using Zoom for several years, and over the past month or so the audio stopped working when sharing a video using 'Share Screen'. 

I teach English 1-to-1 on Zoom, and often use YouTube videos as part of the lesson. 

Before anyone asks, I have updated and reinstalled Zoom, and the problem is happening on both Windows and Mac.

I have "share sound" selected, and have tried using "optimise for video sharing" as well as not optimising (never used to need to do this)

I am using a Platronics mic and have this as the system audio, (as always) for mic and headphones.

I thought it might be a copyright thing, and tried it with Spotify, and it doesn't work with that either, nor does it with iTunes music.

It's really impacting my lessons, and it's annoying because I'm paying for Zoom yet I'm not getting what I need. 

It's worked for years and suddenly it stopped working... I didn't change anything, and I really have tried all the solutions I can find online. 

Any suggestions welcome!

[FarioConsulting]

Hi,

It might be that Zoom is only sharing audio from the Default Desktop audio device. If the audio from your video source (like YouTube, Spotify, or iTunes) is going through a different device, or if the volume on the default device is muted or very low, it might not be heard by others.

You can check this by looking at your Volume Mixer application (on Windows) to see these settings.

FYI You will want to make sure the audio output for your video/audio source is set to the default System output