I think you're talking about the line in settings where it says to put an URL for the titlekeys.
What I think you are doing is scanning the QR code for individual games. And not the one for the actual titlekeys file.
While that what you are doing would work for installing the games in FBI, it is not the code you need.
Try scanning the QR code that you get via the little green button under "Download enctitlekeys.bin" at the top of the site, next to the orange "Download" button. I think you'll see where this is going as soon as you do that.