Relatedly, when I try and choose BT Audio (which is in white as in available) in the media button on the infotainment screen it says BT device not available.
Right, just been out to my van, disconnected my phone completed (by telling phone and Cali to forget the device connection) and retried to connect. I can see what you mean, it’s not intuitive and something of a pain!!
You might have a slightly different stereo unit in your vehicle, but in mine I did the following:
Switched the ignition on
Pressed the ‘Menu’ button (bottom right button on my system)
Selected ‘Media’ option on screen, swiped left on touchscreen to see it
Selected ‘Source’
Selected ‘BT Audio’
Got the iPhone ready by going to the BlueTooth’ settings screen
Selected ’Add new device’ on the VW
The iphone did find the VW, but...
The VW did not find the iPhone....I got an error on the stereo saying ‘BT device not available’
I then switched the ignition off, then immediately back on again (did not take keys out of ignition)
Both stereo and phone immediately found each other and I could pair them!!
Don’t ask me why this works, but it did for me. It makes no sense, but resolved the issue.
(NOTE: When I say ignition on, I mean just turn the key enough for all the electrics to start up, I didn’t actually start the engine)
Hope the above resolves it for you....