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I had the same problem

** I fixed it calling TurboTax and (Help-->pay by phone) the $25 for State e-filling for my Turbotax Premier.

** THANKS to the users who posted the soulution before me

** I bought it at Guifff.com.  I did a search before and nobody marked it as a bad site

NOW,  to all who say it is our bad.  **I disagree**

Intuit is a company with $14.37 Billion in revenue This is $14,370 Million!!!

They have one main product, Turbotax. it is their responsibility to make it is reliable on every phase. 
We use them because we believe they are reliable, if we feel they are not, we would use a different provider. The customer experience is important to keep user trust on the service.

They could have implemented many different validation processes. If the activation-key was not valid (and it is not clear if it was, or was not valid) they had to deny my registration since the beginning. If the key was already associated with another account, they had to notify me immediately. If the other account used the key after me, he had to be notified, and I should have received a warning.  Anyway, if they had promptly notified the issue, than I could have blocked the payment to Guiffin.com on my CreditCard. There are a lot of options to make the process more secure, and form a $15B company I expect they do not fail on the very basic steps.