Notify In my App when other apps installed or removed in same iOS device using MDM

Question

I want get notifire or any type of observer in my app when any other app installed or removed in same device(iPhone/ipad) using MDM.

Just like Outpact app

I just try it in device which has MDM certificated Installed. But getting Nil response

  let managedConf = UserDefaults.standard.object(forKey: "com.apple.configuration.managed") as? [String:Any?] 


Output : nil

I also try NotificationDidChange but it is also not working

NotificationCenter.default.addObserver(forName: UserDefaults.didChangeNotification, object: nil, queue: OperationQueue.main, using: { note in

            print(note.object)

    })

Also checked this Using MDM To Configure An Enterprise App Via NSUserDefaults but not getting result

Please help me or suggestion any idea about it.

Thanks