[Tannaton]

This is a guess but at one point circa 2010-2013 the DAB radio was an option on most Volvo's but they could be ordered with "DAB preparation" which was essentially extra wiring for the DAB aerial and module meaning it could be retrofitted at a later date. Without DAB Prep it cannot. I wonder if your car had that? A call to the dealer with the reg number should be able to reveal the build.

In the meantime check you don't have any phone chargers, dashcam power supplies or other things plugged into the 12v sockets.

I'd also check the manual - it might be on the pre-sensus cars that you have to do a scan before any channels are populated? Again - just a guess on my part.