Hi guys, I know some of you have had trouble registering your online passes, I know there are some issues so I will try to explain your options.
Just to let you know I just activated mine without any problems I entered the code & downloaded the 100kb file that activates it.
First off when entering your code make sure the letters are capitals, if you use lower case you will get the invalid message.
If it still doesn't work a you know the code hasn't been used before then contact Konami Europe here
Fill out the info & someone should get back to you.
Hopefully this helps, if I find out any more info, I will edit this post.