• Open System Preferences > Sound
• Select the input tab and check the volume

• Open System Preferences > Security & Privacy. Select Privacy tab
• Select Camera and check the box next to Zoom/Webex (or whatever applications), granting access to your webcam

• Close other apps that may be using the webcam, such as FaceTime and Photo Booth
• Not sure which app? Click on Apple menu on top toolbar, then select Force Quit… to see all apps running and force quit (if needed)

(macOS 10.15 and higher)

• Open System Preferences > Security & Privacy. Click Privacy tab
• Select Screen Recording and check the box next to Zoom/Webex, granting access to share your screen

• On Chrome in the top right, click More > Settings
• Click Privacy and security on the left, then select Site Settings
• Select Camera and Microphone and set to Ask before accessing
• When joining video conference on Chrome, you will now see a prompt to allow access

• Open Safari and click Safari > Preferences on your top Mac toolbar. Select Website tab
• For Camera and Microphone, verify that "When visiting other websites" is set to Ask

• When joining a video conference on Safari, you will now see a prompt to allow access

• When in a Zoom meeting, in bottom left corner click ^ next to the camera icon to select a different camera

• When in a Webex meeting, on the top toolbar select Audio > Speaker, Microphone, and Camera… Choose your camera from the Camera drop-down at the bottom