To make any permission changes on your Mac the first things you will want to do is open system preferences.
Select the “Security and Privacy” settings.
To make any changes you will need to unlock your setting by clicking on the lock and inputting your computer password (the password you use to unlock your computer).
After that, you will need to make sure that there is a checkmark next to “Cisco WebEx Meetings” under the “Microphone”, “Camera”, and “Accessibility” permission settings.
After that, you will need to click on the lock to save the changes.
After all WebEx permissions are enabled you will need to close and relaunch Cisco WebEx.