It’s been a while but I have vague memories of getting stuck on that too; I just went back to double-check how it works, and are you clicking on the key after you input the code? I don’t think I figured out that I had to do that for a while 
If it’s not that then I’m not sure, if you’re still having trouble I can try to provide more insight 
Ah I remember going down a rabbit hole about this in a previous challenge! (I just looked and it was in February omg, so much time has passed 
) But in case my conclusions are any interest:
Ooooh thank you! It sounds like I need to do some more investigating into amazon japan, see how things compare 