Cheers mate, that's the one I'm trying at the top of the "Thank you for your payment" emailsIt's on every email you get from Klarna at the top it says order no: (8 character code)
Samsung have also sent 2 or 3 emails over the last few weeks about the upcoming upgrade which has the number in too.
The page is currently not working very well.
I suspect the website is just overloaded and that error is their way of coping with it haha