Maybe, or maybe they just test the password you enter against all of the accounts when you try to log in. However it's implemented, this is a well-known, long-

Maybe, or maybe they just test the password you enter against all of the accounts when you try to log in. However it's implemented, this is a well-known, long-standing "feature" of Amazon. I think it happened to me once when I first tried to sign up for AWS, and accidentally ended up with a second Amazon account. See http://adaptivepath.org/ideas/the-woes-of-multiple-accounts/ http://adaptivepath.org/ideas/the-woes-of-multiple-accounts/