Automation on car bluetooth

I'm currently trying to set some automations for my daily commute, triggering when I leave the street in the morning (thus not using a verbal trigger).

This works fine for setting my navigation, but part of the routine is playing some music (on spotify), however my car bluetooth receiver is no Google Home device. I cant seem to set the music to just play on my phone (which will thus use the bluetooth speaker), only my at home Google devices.

Is there any way to get this working?