the keys on tt like all VW/AUDI are programed using the geko systerm, what hell have to do is get a lock set from a dealer (i can get one), the new lock set will come with a key number and a basic key

once this is done it need to be programed by a deler/good locksmith that has access to the geko system, whihc is linked to the factory, and reprogrames the trasponder in both the key and the remote