Hi,
In order to block the camera, assuming you are working with iOS 13 devices, the device needs to be in supervised mode. Sounds like you have blocked the camera from use under Device Settings which will only work for devices prior to iOS 13.
If above is met the setting is:
Policy - Supervised Settings - Restrictions & Network - Allow use of camera.
A number of functions are only available on supervised devices, full list:
https://support.apple.com/guide/mdm/supervised-restrictions-mdm54960f92a/web
Hope this helps
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