It’s the original first kindle that they did.which kindle do you have? You need to make sure you are using Amazon website (safari if iPhone) and not the app. X
I’ve deregistered the original account from it and logged in again. The kindle is now shown as recognised in my Amazon account online but when I send my borrowed books to it it just says ‘attempted’ and that’s it. I’ve tried switching it on and off and sending the books back and reordering them.
It’s doing my head in