Amazon really did not want my mother using that new e-mail address.
My mother wanted to change her e-mail associated with her Amazon account. She'd enter her new e-mail, confirm the code, and oddly be asked to enter her password again — only to be told that she could not use the e-mail with a business account.
We contacted Amazon, and they confirmed she did not have a business account. They also confirmed there is no other account associated with that new e-mail.
Since she had no outstanding orders and no one ever got back to her about why she could not use her new e-mail address, we canceled her Amazon Prime, removed her address book and payment from her old account, and then signed her up for a new account.
The new account has not been used. The only thing on file was her e-mail and address to be used later when she shops. No payment information added yet, either. And a few days later, it's now suspended.