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Hi and welcome to JustAnswer, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially and based on "...bought it used...", was the Kindle de-registered by the previous owner prior to the transfer of ownership?
If the Kindle was previously registered to another user, then Amazon would prevent it being registered to a new user. This is a security measure and there is no workaround.
The only solution would be for the first owner to de-register it from his/her account. It can and may be done even on a computer and not necessarily on the Kindle device.
Would the steps to do this serve your need please?
If have not been tried by the previous owner...To deregister a device: