I have one of these. Haven't really tried to talk to it yet so not sure. I did update the firmware the moment I got it connected a couple of weeks ago and while it doesn't match the manual or the video on YouTube apart from looks, it has behaved surprisingly well.
Have you tried using the long press on the steering wheel to activate the voice control? In my car a short press activates the car control and a long press passes through to Android Auto.
If you have any examples you would like me to try, let me know.