Android auto Google Assistant not working

[Android Central Question]

Just brought a new Sony Head unit with Android auto, Now when I say "Okay Google" it picks up me saying it then doesn't allow me to say anything else, I can't get any navigations or use any command's. When someone messages it reads me the message and allows me to reply so I know my microphone is working correctly. I've tried uninstalling and reinstalling both AA and Google apps without any luck, I've checked all the permissions which are all on... Any ideas would be greatly appreciated, I'm using a OnePlus 5t