This seems really weird, especially on Android. With Android, you can have the app register a function with a bluetooth intent, to have your app woken/invoked for a specified bluetooth action. That means, it's very easy to have the car signal the Tesla app to wake up long enough to authenticate the phone key, even if the app is not running/loaded.My car will not open away from home without the app running in the background. At home I have the car set to not lock so off course it opens. It won’t however start unless the app is open or running in the background. Tesla confirmed this is required.