Android Auto - Fully Managed Devices

Hi 

Has anybody experienced issues getting Android Auto running on fully managed devices.

From what I can see most of the components are installed & the service tries to launch before failing to connect on any make/model vehicle, just a black screen.
Some infotainment systems ask if confirmation required on my mobile device & just sit there.

Ive checked the device restrictions policy & nothing appears blocked that I can see.
It dose appear that its unable to install the android.tts "speech Recognition & Synthesis feature even if i push this out via Sophos.
The install just loops when manually attempted & fails to install via push, b
oth Android Auto & TTS have "use managed configuration" checked in Sophos central.

Any advice would be appreciated.