Same issue here, my app uses CWWiFiClient.shared() to retrieve SSID name and it currently returns nil on macOS Sonoma beta 2

Finally found a fix to the problems we had with AR being disabled in ARQuickLook on our native app, thanks to this article https://levelup.gitconnected.com/creating-an-ios-ar-app-using-the-ar-quick-look-api-fe31aede5267 You have to dissociate the ARQuickLookViewController from the struct UIViewControllerRepresentable in two separate files, and from that the AR feature will magically work. We originally had both of them inside merged inside the same file and that sadly made the AR part stop working on iOS 15+ devices. (But still work on iOS 14 devices!) As for AR Quick Look from Safari, I think the issue was fixed in previous iOS 15 betas. If you still have the issue make sure the QR scanner is closed in the background and not using the camera or the AR feature will not function at the same time.

This issue is still happening on iOS 15.3 beta 2

Having same issue on my app here, since iOS 15 the AR Button is constantly disabled, however it is enabled on iOS 14...

Still having the issue on iOS 15.2 beta 1 as well, reported on FB9735221