Warcraft III - The cd key provided is invalid

I recently bought copies of Warcraft 3 and TFT. Redeemed the codes and downloaded the clients. When i tried to use Battle Net however i got a "The cd key provided is invalid" error, and now i get "Unable to connect to Battle Net".

How could my product key be invalid? How can i fix the problem?
Update : I did a clean installation and this time i was asked for the key by the installer, so the problem must be gone. I still get the "Unable to connect to Battle Net" error though, which i understand must be a ban for using a wrong key.

My question is : How long till the ban is lifted? Do i have to do something for this to happen?

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