Bluetooth call issue in 2006 BMW

(Not sure if this should be a separate topic, and definitely not trying to threadjack, but this seems related so I’ll post here and you can split it off if need be, that said:)

I had an issue taking a call in the car today - Bluetooth handled connection and answering just fine, but wasn’t sending audio through the car speakers, however the caller could hear me just fine.

I’m coming from a Nextbit Robin that was running linageos 15 which also had trouble, though differently, but was just fine when it was running factory supported Android (I think they stopped at 8).

It’s a 2006 BMW for whatever that’s worth, so kinda old tech. Maybe a Bluetooth version mismatch? Haven’t experimented, but maybe that’s something to look into? Any other suggestion would be appreciated.