Amazon

https://www.amazon.com
Recommended Configuration SMS
Alternate Configuration 1 SMS; Authenticator
Alternate Configuration 2 Authenticator
Alternate Configuration 3
Account/Password Recovery PR SMS; PR email
Remarks backup signup available
Responses

Notified on January 11, 2020.

Closed as won't fix on January 12, 2020; claimed that customers appreciate the current policy on SMS authentication despite the issues.

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