The problem is solved. I changed requestAlwaysAuthorization() tp requestWhenInUseAuthorization() and added NSLocationWhenInUseUsageDescription to info.plist. Once the prompt showed up everything started to work including the SpatialAnchors lib. Thanks for helping me!

I'm not getting any prompt. Calling requestAlwaysAuthorization() in viewDidLoad of my view class ARViewCtrl: UIViewController, MTKViewDelegate, UITextInputTraits, CLLocationManagerDelegate { ... } Why doesn't this prompt appear?

I have a Mac mini (2012) with macOS Catalina 10.15.7. So NEHotspotNetwork.fetchCurrent() is not available. Here is my test code: mLocationManager = CLLocationManager() mLocationManager!.delegate = self mLocationManager!.requestAlwaysAuthorization() ... func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {      print("status: \(status.rawValue)")      let interfaces = CNCopySupportedInterfaces() as NSArray?     print("interfaces: \(interfaces!.count)")      let interface = interfaces![0] as! CFString      print("interface: [\(interface)]")      let info = CNCopyCurrentNetworkInfo(interface) as NSDictionary?      if (info == nil) {       print("info: nil")      } else {       print("info: not nil")      } } // OUTPUT: status: 0 (notDetermined) interfaces: 1 interface: [en0] 2022-08-03 10:43:23.335260+0100 DimensionX[3066:1830775] [] nehelper sent invalid result code [1] for Wi-Fi information request info: nil

Same problem. Apple, don't be Google!

Every cross-platform engine is written in C + + . Performance aside, having Metal C + + API would save tremendous amount of effort for developers worldwide.