I'm trying to link my Nintendo ID and Club Nintendo account to my 3DS. But every time the e-shop asks for my Club Nintendo username and password, it gives me the 011-7401 error, which says I've entered the information incorrectly.
I have this information written down, and I used it to log into my Club Nintendo account on the computer I'm using to type this. So why does my 3DS, or rather the e-shop think I'm screwing it up? Even after triple-checking to see if I've misspelled something, it still tells me I've screwed up somehow.