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!! SOLVED !! It turns out that preparing an application for speech recognition using live audio from the microphone is a two step process. The first step is well documented and involves adding a key to the app's info.plist document. The following screenshot shows the entry that is needed in the app's project file. To add a key via the UI, mouse-over any key, and click the plus icon that shows to the right of that key. You can then choose the needed key from the drop-down list that appears next. After choosing the key, you will need to add some descriptive text that will show in the permissions request window when the app is first launched on the computer/device. The second step in this process is not well documented. I stumbled upon it accidentally while researching something for a different matter. Evidently, MacOS apps run in a sandbox and need to register which capabilities they want to use. The following screenshot is found in the Signing & Capabilities tab of the app's project file. Look for the section labelled 'App Sandbox'. If it isn't there, you may need to add it via the +Capability button found just below the tabs. Look for Audio Input in the 'Hardware' group and ensure that the checkbox is checked.

Do you just see these problems when running in XCode? Do the same problems exist if you execute the built app from the product build directory?

Thanks for the links. They were helpful, but not complete.I've got an AVRoutePickerView on my screen, and I added an observer to the NotificationCenter (as directed in the documentation). However, when I choose the AppleTV from the view picker, I get the following error message:MPMediaControlsRemoteViewController Dismissing because view service terminatedI was unable to find anything in a Google search regarding a cause/solution for that message.However, if I first mirror my iPhone to the AppleTV before launching my app, the observer method does get fired, and I can see the 2nd screen. That's definitely further than I had gotten before, but I'd like to know how to get the AVRoutePickerView observer to work properly. Here are the pertinent parts of my code (a SpriteKit game), in case it is needed for reference:GameViewController:override func viewDidLoad() { super.viewDidLoad() let notifier = NotificationCenter.default notifier.addObserver(self, selector: #selector(GameViewController.screenDidConnect), name: NSNotification.Name.UIScreenDidConnect, object: nil) notifier.addObserver(self, selector: #selector(GameViewController.screenDidDisconnect), name: NSNotification.Name.UIScreenDidDisconnect, object: nil) let skView = self.view as! SKView let scene = TitleScene(size: (skView.bounds.size)!) scene.backgroundColor = SKColor.black skView.presentScene(scene) }@objc fileprivate func screenDidConnect(notification: NSNotification) { print("GameViewController: Screen was connected: \n\(notification)") print("# of Screens: \(UIScreen.screens.count)") } @objc fileprivate func screenDidDisconnect(notification: NSNotification) { print("GameViewController: Screen was disconnected: \n\(notification)") print("# of Screens: \(UIScreen.screens.count)") }Any ideas as to what I'm missing?

I finally got the code to work. Posting here in case anyone else comes upon this and needs a similar solution.I changed 2 items. 1) When comparing screen widths to the initial view, I used 'bounds' instead of 'frame'. 2) I turned off the 'Hello World' label fade in animation (the text stayed transparent for some reason). func checkForExternalDisplay() { let screens = UIScreen.screens if screens.count > 1 { let mainScreenIndex = self.view.bounds.width == screens[0].bounds.width ? 0 : 1 let otherScreenIndex = self.view.bounds.width == screens[0].bounds.width ? 1 : 0 let primaryScreenIndex = screens[0].bounds.width >= screens[1].bounds.width ? 0 : 1 let otherWindow = UIWindow(frame: screens[otherScreenIndex].bounds) otherWindow.rootViewController = UIViewController() otherWindow.screen = screens[otherScreenIndex] let windowRectangle = CGRect(x: 0, y: 0, width: screens[otherScreenIndex].bounds.width, height: screens[otherScreenIndex].bounds.height) let otherView = SKView(frame: windowRectangle) otherWindow.addSubview(otherView) otherWindow.makeKeyAndVisible() otherWindow.isHidden = false if primaryScreenIndex == mainScreenIndex { primaryView = self.view as? SKView } else { primaryView = otherView } } else { primaryView = self.view as? SKView } primaryView?.backgroundColor = SKColor.green }(code from GameScene.swift) override func didMove(to view: SKView) { // Get label node from scene and store it for use later self.label = self.childNode(withName: "//helloLabel") as? SKLabelNode // if let label = self.label { // label.alpha = 0.0 // label.run(SKAction.fadeIn(withDuration: 2.0)) // } // Create shape node to use during mouse interaction let w = (self.size.width + self.size.height) * 0.05 self.spinnyNode = SKShapeNode.init(rectOf: CGSize.init(width: w, height: w), cornerRadius: w * 0.3) if let spinnyNode = self.spinnyNode { spinnyNode.lineWidth = 2.5 spinnyNode.run(SKAction.repeatForever(SKAction.rotate(byAngle: CGFloat(Double.pi), duration: 1))) spinnyNode.run(SKAction.sequence([SKAction.wait(forDuration: 0.5), SKAction.fadeOut(withDuration: 0.5), SKAction.removeFromParent()])) } }