Yup. Welcome to our world. If you are getting this, and getting the same customer code every single time, you can call Apple. Read the last chapter of the guide in post 1 on how to go about that.
But that said, even though they have unblocked it for a lot of us, it still won't log in and gives the same customer code every time. For SOME accounts, and I can't figure which ones, you have to get your ROM/MLB combo whitelisted, and I THINK there is an additional check to make sure they are a valid combination. So for some accounts the random digits added to serial to make an MLB won't work. But no one at this time really knows what that MLB should be formatted as. The best discussion on that is probably
this one at Insanelymac. My current best theory is for newer iCloud accounts, you need a valid MLB/ROM combo (ie properly formatted, so that it COULD be an authentic Apple MLB/ROM even though it doesn't yet exist in their system) that has been whitelisted by Apple. What it takes to make that valid combo is still unclear.