21740: Invalid Business Contact Email for 2FA Verification

This error occurs when the email used for 2FA verification with Auth+ is missing, malformed, or fails internal validation checks. The email must be valid and correspond to the authorized business representative.

The email is blank, improperly formatted, or fails domain checks.

Confirm that the business contact email is provided and valid. Use a business email that reflects the brand's verified domain. Contact Twilio Support.