Just thought I'd add my experience.
I bought the small usb dongle type before finding this post. Mine came updated with the latest firmware (1.04 I think).
I have a 65 plate Cupra
280 - I didn't spec full link originally but had it activated shortly after receiving the car so they added the cubby usb and aux port (don't think it was there originally but can't remember now). Wired AA works fine, have had some connection issues over the years but usually due to poor USB cables.
I have a galaxy S10 running android v12 so not new by any means but it is capable of wireless AA as was able to test it working on a relatives Aston which had an aftermarket wireless AA system.
Checked my headunit firmware and found it was on the 0245 so manually updated to the latest officially support 0253 version in hopes to get it working but no joy - when I plug the dongle in the cubby USB, everything looks okay initially, can connect to it via bluetooth and on phone it says wireless AA available continue on cars headunit. Full link icon doesn't change to AA however, Autobox is available in devices - when I select Autobox it tries to connect, then the dongle BT connection too phone drops and the headunit says "USB: Device not supported". Real bummer, can't imagine its a duff unit but its a possibility I suppose.
Maybe my headunit is to old of a version to work? any ideas/suggestions would be welcome - I was hoping as wired AA works this would also do the trick!