Carl Baker is your man. You can only code a limited number of fobs to the car.
The other aletrnative (which I did for one), is but a meta fob from ebay, open it up and swap the pcb from the old fob to the inside of the new fob. You will need to take the key blade as well
FYI He's in [Sweden?] for a few weeks and so likely to have a bit of a backlog by the time he gets back. Best to drop him a note sooner rather than later to book your place in the queue....