Step 1: Use Google Chrome
If have been using Safari or Firefox as your prime web browser. Visit Google.com to download and install the latest version of Google Chrome.
Step 2: Chrome Settings
In the web browser window, next to the URL, click on the Lock icon. Check that your Camera and Microphone are set to Allow.
Step 3: System Preferences
Locate your System Preference and select Security and Privacy from the menu. Click on the Privacy tab and add a check in the box for Google Chrome under the Camera option, Microphone option, and Screen Share option.
Note: If you are on any MacOS before Catalina, Screen Share will not be listed. Only check the Camera and Microphone options.