Tap Settings > General > Profiles or Profiles & Device Management. Under the “Enterprise App” heading, you see a profile for the developer. Tap the name of the developer profile under the Enterprise App heading to establish trust for this developer. Then you see a prompt to confirm your choice.
When the app is installed and user executes the ‘Scan Barcode’ function the first time, iOS will ask permission to use the camera. If the user responds ‘Do not allow’, the camera becomes disabled. When attempting to scan the barcode, the app shows the ‘barcode reader license not available’ message. Please check the application capabilities from the settings, “App Name” / access “Camera’ setting must be set to “ON”. The Scan Barcode feature should then function as expected.