If you call Microsoft, they'll give you one over the phone. This is a known issue and the resolution, until Microsoft gets the process fixed, is to contact their customer support # in your country or region to get your key.
Hi
Spoke to a helpful guy at Microsoft (0800 026 0329) less than an hour ago, told him problem, he asked for some details and emailed key to me, all working fine.
Worth a try.
I've had the key sitting in my inbox since the offer was announced, I applied for one then. But I had to wait until I could afford to get a copy of Windows 8 Pro to install it on. Got that now, installed the key, and all is working fine. Very pleased. Wenda.