challengeName

The name of the challenge that you're responding to with this call. This is returned in the AdminInitiateAuth response if you must pass another challenge.

• MFA_SETUP: If MFA is required, users who don't have at least one of the MFA methods set up are presented with an MFA_SETUP challenge. The user must set up at least one MFA type to continue to authenticate.

• SELECT_MFA_TYPE: Selects the MFA type. Valid MFA options are SMS_MFA for text SMS MFA, and SOFTWARE_TOKEN_MFA for time-based one-time password (TOTP) software token MFA.

• SMS_MFA: Next challenge is to supply an SMS_MFA_CODE, delivered via SMS.

• PASSWORD_VERIFIER: Next challenge is to supply PASSWORD_CLAIM_SIGNATURE, PASSWORD_CLAIM_SECRET_BLOCK, and TIMESTAMP after the client-side SRP calculations.

• CUSTOM_CHALLENGE: This is returned if your custom authentication flow determines that the user should pass another challenge before tokens are issued.

• DEVICE_SRP_AUTH: If device tracking was activated in your user pool and the previous challenges were passed, this challenge is returned so that Amazon Cognito can start tracking this device.

• DEVICE_PASSWORD_VERIFIER: Similar to PASSWORD_VERIFIER, but for devices only.

• ADMIN_NO_SRP_AUTH: This is returned if you must authenticate with USERNAME and PASSWORD directly. An app client must be enabled to use this flow.

• NEW_PASSWORD_REQUIRED: For users who are required to change their passwords after successful first login. Respond to this challenge with NEW_PASSWORD and any required attributes that Amazon Cognito returned in the requiredAttributes parameter. You can also set values for attributes that aren't required by your user pool and that your app client can write. For more information, see AdminRespondToAuthChallenge.In a NEW_PASSWORD_REQUIRED challenge response, you can't modify a required attribute that already has a value. In AdminRespondToAuthChallenge, set a value for any keys that Amazon Cognito returned in the requiredAttributes parameter, then use the AdminUpdateUserAttributes API operation to modify the value of any additional attributes.

• MFA_SETUP: For users who are required to set up an MFA factor before they can sign in. The MFA types activated for the user pool will be listed in the challenge parameters MFAS_CAN_SETUP value. To set up software token MFA, use the session returned here from InitiateAuth as an input to AssociateSoftwareToken, and use the session returned by VerifySoftwareToken as an input to RespondToAuthChallenge with challenge name MFA_SETUP to complete sign-in. To set up SMS MFA, users will need help from an administrator to add a phone number to their account and then call InitiateAuth again to restart sign-in.