Logitech Muse never appears under Settings > General > Spatial Accessory — spatial tracking permission never granted

Hi @positivevibemindset,

Sorry to hear you're experiencing issues tracking the Logitech Muse. Your setup sounds correct overall—the inclusion of the NSAccessoryTrackingUsageDescription being particularly important—so my only other lead given the symptoms you've described is that accessory tracking authorization is somehow not being requested by the app. Do you recall ever seeing a pop-up asking if you want to "Allow YourAppName to access the movement of your accessory?" when running the app? Additionally, could you tell me more about how/where you're calling SpatialTrackingSession.run(), as well as the specific error you're encountering when you run that?

In case it's helpful, here's a snippet that successfully tracks the Logitech Muse stylus when I run it on my device:

struct SpatialStylusTestView: View {
    let root = Entity()
    
    let session = SpatialTrackingSession()
    let configuration = SpatialTrackingSession.Configuration(tracking: [.accessory])
    
    var body: some View {
        RealityView { content in
            content.add(root)
            
            // Run the spatial tracking session.
            await session.run(configuration)
        }.task {
            do {
                // Setup tracking for styli that are already connected.
                for stylus in GCStylus.styli {
                    try await setupSpatialStylus(stylus: stylus)
                }
                // Setup tracking for new styli as they connect.
                for await notification in NotificationCenter.default.notifications(named: NSNotification.Name.GCStylusDidConnect) {
                    guard let controller = notification.object as? GCStylus,
                          controller.productCategory == GCProductCategorySpatialStylus else { continue }
                    try await setupSpatialStylus(stylus: controller)
                }
            } catch {
                print("Failed to setup spatial stylus: \(error)")
            }
        }
    }
    
    func setupSpatialStylus(stylus: GCStylus) async throws {
        // Get the anchoring source and location for the stylus.
        let source = try await AnchoringComponent.AccessoryAnchoringSource(device: stylus)
        guard let location = source.locationName(named: "aim") else {
            return
        }
      
        // Create the anchor entity.
        let stylusAnchor = AnchorEntity(.accessory(from: source, location: location),
                                        trackingMode: .predicted)
        
        // Attach a model component to visualize the anchor entity.
        stylusAnchor.components.set(ModelComponent(mesh: .generateSphere(radius: 0.01), materials: [SimpleMaterial()]))
        root.addChild(stylusAnchor)
    }
}

Could you try opening this view as an immersive space (in a project with an NSAccessoryTrackingUsageDescription plist entry) and let me know what happens? You'll know it's successful if you see a small white sphere anchored to the tip of the stylus.

Thanks!