21740: Brand Registration Failure: Invalid Brand Contact Email Domain
PROGRAMMABLE MESSAGING
ERROR
The brand contact email submitted uses a domain that is not permitted for 2FA validation. Only business or organizational domains are allowed for Auth+ verification.
The domain used in the brand contact email is a personal, generic, or otherwise unverified domain (e.g., gmail.com, yahoo.com).
Update the brand contact email to use a domain that is associated with the business or organization. Avoid free, personal, or unverified domains.