I think that's what the issue is actually. The Xperia 10 II isn't in the list of devices. All the other handsets I have owned are there, including the Aqua Fish. I can't remember how to add devices to my account.

I'll whizz another email off to Jolla and see what they can do. They have already transferred the un-used license over to the 10 II but without the IMEI number it's not going to work.