My routine with my VW Polo and Android Auto that works perfectly for me:
- I start the car (Engine and system started)
- Unlock NP2
- I connect NP2 with a good USBC cable
- I wait a few seconds, if it does not open automatically, I put the NP2 in data transfer.
It has only failed me once in all this time. The connection is great next to any Xiaomi I have had.