UKPassats

So I used to have an RCD300 with a Nokia ck7 bluetooth kit. When I got a call it used to mute the radio and put bluetooth audio through the speakers. I changed and reconnected the bluwtooth to the radio. Pins 6 and 12 as the diagram I found suggested. Phone connects to bluetooth but it will not come through the radio. Any suggestions?

I tried enabling microphone and Bluetooth in vag com but just throws module not found errors.