This is explained in the tutorial I linked to. https://levelup.gitconnected.com/creating-an-ios-ar-app-using-the-ar-quick-look-api-fe31aede5267

Sorry I meant iOS 15.2 beta 2*

Hello, my feedback number is FB9735221. The original issue used to be third party apps in general, but turns out on iOS 15.2 beta 3 AR QuickLook works fine in third party browsers, but still not via an app. Thanks