There's a problem with the Founders input site, there has been a lot of threads where players complaining about the same issue. the site has been that way for months, so its not just you.

Founders FAQ: http://www.callofduty.com/founder/faq

My Code is Valid, but Doesn't Work?

Each code is one time use. If you believe you are getting an incorrect error please contact Activision Customer Service.(http://www.activision.com/support)

Contacting support is the best way to go, they will investigate it and apply it if everything is good.

*** You must have Premium before you can apply a Founders Status to your Elite Account. You will get the error regardless.

This was posted by activition regarding the Founders Code problem. It was posted some time today.

http://community.callofduty.com/thread/200513840

ATVIAssist wrote:

 

Well hello there Gezza91,

 

The Founder web site is functioning as it's supposed to now. And thanks for chiming in Jamaican-4Lyfe. So Gezza, are you a premium member already? If so, go ahead and try redeeming your Founder code. If not, where did you purchase the Hardened Edition? What's your gamertag/PSN ID?

 

Regards,

^JH

In my opinion the site won't be fixed. They even gave a deadline to when the code could be used; it makes no sense since the site is broken. The code has to be used by Nov 12.

After the 12th they are going to just tell you that you missed the dealine, when the know the site isnt working in the first place.