eBay - reported as fixed; original findings shown

http://www.ebay.com/
Recommended Configuration Proprietary; Email
Alternate Configuration 1 SMS; Email
Alternate Configuration 2
Alternate Configuration 3
Account/Password Recovery PR SMS
Remarks automatic email backup signup using email on file; 1-step login with OTP available if 2FA is not enabled
Responses

Notified on January 11, 2020.

Reported as fixed (removed support for SMS as a method for account recovery and 2FA simultaneously on new devices) on February 8, 2020.
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