Automatic Update License Key Problem

I am trying to set up automatic update according o the instructions on the FAQ support page. I found my license key on my account but when I add it to the license in the websites "About Theme" section, to says "keys do not match" My account also lists the license as inactive...not sure why. When I click "Activate Key" in the About theme section it just reloads the current page and does nothing. Help? Thanks! Amy