Problems registering kindle?
I set up Amazon acct keep getting referred to kindle.com/support. Due to server error.
So go to kindle.com/support and get it sorted out.
Maybe there is something wrong with Amazon server or your internet connection. You can try more times.
Try registering your Kindle in an alternative way, by registering it under Manage Your Account. Here you can find a user discussion on this, see if it works.
If problem persists, you need to contact Amazon support for help.