title: AR Camera Black Screen in Unity3D
body: <p>Unity 2019.4.1f1
  I have built and ran the demo scene with a cube successfully before. Now, the build is only showing a black screen and the camera permission is never raised when starting the build for the first time. And the camera never shows anything. Does anyone have any ideas what might have changed?</p>
  <p>Using Pixel XL, ARCore, ARFoundation
  or while using the iOS version with iPad Pro, ARKit, ARFoundation.</p>
  <p>Please can someone help?</p>