macOS — How can I authorize my app to send Apple Events?

Question

I have a non-sandboxed app and I'm attempting to run a few lines of AppleScript occasionally in a handler. The handler is running, but I get the following error regardless of my settings. I've tried opening new projects, using new app IDs, running from Xcode and launching the app directly — everything I can think of and I still can't get this AppleScript code to run. The debugger just prints the following error code each time the handler runs:

{
  NSAppleScriptErrorAppName = "System Events";
  NSAppleScriptErrorBriefMessage = "Not authorized to send Apple events to System Events.";
  NSAppleScriptErrorMessage = "Not authorized to send Apple events to System Events.";
  NSAppleScriptErrorNumber = "-1743";
  NSAppleScriptErrorRange = "NSRange: {117, 9}";
}

Here is the handler that is getting called at the appropriate time.

func centerCursor(appName: String? = runningApp.localizedName) -> Void {
  guard let appName = appName else { return }
  
  let aScript = """
            on getCenter(\(appName))
            set midX to 0
            set midY to 0
            
            tell application "System Events"
            tell application process \(appName)
            set frontmost to true
            delay 0.5
            set currentWindow to window 1
            set windowPositon to the position of currentWindow
            set windowSize to the size of currentWindow
            {"Position", windowPositon, "Size", windowSize}
            
            set midX to (item 1 of windowPositon) + ((item 1 of windowSize) / 2)
            set midY to (item 2 of windowPositon) + ((item 2 of windowSize) / 2)
            
            {midX, midY}
            
            end tell
            end tell
            
            return {midX, midY}
            end getCenter
            
            getCenter("\(appName)")
            """

  if let script = NSAppleScript(source: aScript) {
    var error: NSDictionary?
    script.executeAndReturnError(&error)
    if let err = error {
      print(err)
    }
  }
}

And here are some screen grabs of my settings. Am I missing something obvious? Do I need a different certificate or profile to make this work? The app never shoes up in System Preferences