Zoom audio troubleshooting
Make sure you are using “Join Audio by Computer” when you join the meeting. Click on the big green button in the middle. If you are already connected with the computer audio, the button will be red “Leave Computer Audio”. There is also a “Test Computer Audio” link below the button that can assist in troubleshooting.
The audio setup settings can be found in the bottom corner of the Zoom window when you are in a call. You can confirm your settings and check on which mic you are using. I always recommend using a USB headset for videoconferencing to ensure audio quality.