I had same problem... "enter valid authorization code" I e-mailed the website and this is what they wrote back:
If you bought a 1 Hour Guarantee card but were not provided an access code on your receipt or if the access code doesn’t work, please return to the store and ask them to use your current 1 Hour Guarantee Card to purchase another 1 Hour Guarantee Card which will provide the access code at the end of the purchase.
Hope this helps! :-)
