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I cannot allow camera and microphone of my macbook pro to be used in different applications (Google Chrome, Slack etc.) as they do not appear in System Preferences->Security & Privacy->Microphone/Camera.
Since, there are no apps and no way to add them, there are no tickboxes as explained here: https://support.apple.com/en-gb/guide/mac-help/control-access-to-your-camera-on-mac-mchlf6d108da/mac
Same problem, it seems I have once denied a permission for an App and now I need it. Can't get it enabled, as it is not listed. – kuhnroyal – 2019-07-18T12:08:18.853
did you make any system changes recently? In my case, I did modify uid/gid of a user. I wonder that did this. – nir – 2020-02-07T17:31:06.920