Battle.net merge fails at Game Key??

Got the email today from Blizzard asking me to merge to a Battle.net account. Okay, seems legit; I've seen WoW everywhere saying this is mandatory, and yay a new pet!

I log in, merge the account and now it's asking me to add my games, I'm assuming so I can actually play? Sure.

"Enter a game key in the field below to add it to this Battle.net account. Once added, you can download it to any computer at any time, free of charge."

Okay, Except that apparently "You have entered a World of Warcraft® key that is currently not supported in Battle.net account management.
This type of key can be redeemed through the World of Warcraft® account management page."

So I don't have any games associated with my new Battle.net account, and when I click on the link to go to the account management page, it says there's an error. Well of course there is.

I click on the link that says Return to Account Management, and it doesn't go anywhere. 5x.
I log out, log back in and everything's normal, only, I have no idea where I'm supposed to go to change my game key to something Battle.net will accept.

Additionally, after reading of all the instances of hacking due to this merge, I'm not sure I WANT to merge this and will most likely give up playing if anything like this is endangering my game, BEFORE the November 11th "deadline".