Microphone problem

[beeklaw74]

I am having a problem setting up zoom on my new iMac. Specifically, I have been unable to be able to get my microphone to register my guitar so that others can hear it. The input meter hears my voice, just fine, with the green input meter showing that I am speaking. The other zoom participants can hear my voice, but they cannot hear anything when I play my guitar. In the audio settings, I have tried virtually everything I could think of, and nothing seems to work. I have it set for musicians, which is the recommendation I get from what I am reading on the zoom website, but that doesn't work, either. I am at a loss and then wondering whether anyone else has encountered this problem and whether there is a fix for it. It seems that it should be simple. I have never had a problem with this using zoom on a windows laptop, or on my old iMac but possibly there is something about my new iMac..