Ar brings grey or black screen after toggling AR . Already set camera settings to transparent as well as transparent canvas in settings

https://playcanv.as/index/11f41aee

Heres the link im using Variant launch
As i said above i already have the AR camera clear colour as transpearent and transparent canvas has been checked in the render settings
On android it works fine but it does the grey screen on ios yet it shows my camera is in use . Is there any other plane i need to make transparent