System says that valid activation code does not exist

[Coolnagard 0]

I tried to switch my Nitro account to a new computer. I deactivated all of the users on the portal, so now there are 0 activations. When trying to activate on my new computer, the system says that the serial code does not exist. I am entering the right security code, I have the original email from purchasing the program. Can you please advise as to how i fix this? 

[Leslie V. 0]

Hello @Coolnagard

Thanks for reaching out to us! 

Please send me the serial number via direct message so I can check.

Thanks!