challengeParameters

The challenge parameters. These are returned to you in the AdminInitiateAuth response if you must pass another challenge. The responses in this parameter should be used to compute inputs to the next call (AdminRespondToAuthChallenge).

All challenges require USERNAME and SECRET_HASH (if applicable).

The value of the USER_ID_FOR_SRP attribute is the user's actual username, not an alias (such as email address or phone number), even if you specified an alias in your call to AdminInitiateAuth. This happens because, in the AdminRespondToAuthChallenge API ChallengeResponses, the USERNAME attribute can't be an alias.