If you have gone through the GENERAL TROUBLESHOOTING CHECKLIST for the external camera and the camera still won’t work on MAC:

  1. Go to System Preference --> Security and Privacy --> Privacy tab --> Click on the Lock Icon at the bottom left of Security & Privacy Tab --> Enter the system Password (the password used to access computer when computer is first started) > Click on the check box in front of MVProctor.

            Camera:

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Then click on Automation and check Google Chrome and System Events.

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  1. If you still face issues with the webcam try installing Manycam by following the steps given at: 

https://verificient.freshdesk.com/a/solutions/articles/1000279259-app-crashes-during-facial-scan-workaround-manycam-