Bluetooth not working

My father has a 2021 XC40 recharge and is thinking of replacing it because of something that seems like it should be very solvable to me (but I don't own or drive this car). He's saying that he can't connect his car to any bluetooth audio sources, that he's taken it to the shop and they can't fix it. The reality is he might be having some basic user errors but I'm wondering if other people have had any recurring issues getting bluetooth to work with their car.