Phonebook does not sync with Golf 2018 via Bluetooth

[Talkless]

Previously I've tried using Volla Phone X (and earlier BQ Aquaris E5) with Parrot car Bluetooth setup. Result was that contacts did sync, but my Parrot mic sound was not forwarded to other side. I've heard what other person is talking via car speakers, but they did not hear me.

Now with Golf 2018 multimedia all sound works fine, but car multimedia fails to sync phonebook. It just immediately returns to the same prompt after split second of trying to sync. I can call by entering number manually via car's touchscreen, or initiate call via phone, but I can't select number from multimedia phone book, as it is not synced (empty).

Is there a way to workaround this? What's the best way to debug this?

Thanks!