So here I am sitting quietly grumbling in my head at why this is not working. Basically I'm trying to register my Oyster Card online but whenever I enter my card number it asks me for my security question to be answered. So I answer it but still I get the same message each and every time.
Your Oyster card number and security answer do not match. Please check your entries and try again.
Why can't things be made more simple, oh and another thing the help section on their website has nothing about it.