Did you buy a proper vw mk7 key ?Think you'll find the ones we bought are specially made after market ones made to fit the mk5 board ???
Try https://www.ebay.co.uk/itm/142976546394That's where I'm going to order mine from.
I'm not sending the key so I'm not that worried. He'll send the shell, I'll swap the internals and then get the key cut. Perfect for me. Best part is with eBay guarantee if it doesn't fit or work, I can just return it.