When the Camera screen is dark/blacked out it means someone has denied the Snap&Read Universal iOS app from accessing the devices camera.
You can give Snap&Read access to the Devices Camera by:
1. Tap on the Devices Setting's. (Cog icon)
2. On the Left hand side scroll down until you see,"Snap&Read".
3. Tap on, "Snap&Read"
4. On the right side of the screen you should see," Camera".
5. Toggle the switch to the right of Camera, to turn it back on.*
*If you cannot access settings or toggle camera on, your device may be managed by your IT department. You will need to then contact your IT to get access to the camera.