# 30753: Brand Registration Failure: Unsupported email address

Log Type: APPLICATION

Log Level: ERROR

## Description

This error appears when the email submitted for A2P 10DLC brand registration is not accepted. Registration can fail when the email address is not well formatted, uses an unknown or disposable domain, or uses a personal or generic domain that is not accepted for brand contact verification.

### Possible causes

* The email address is not well formatted, or the domain uses invalid address syntax.
* The domain is unknown, disposable, or otherwise not supported for brand registration.
* For registrations that use Authentication+, the `brand_contact_email` uses a free, personal, or generic domain instead of a business or organizational domain associated with your brand.
* The email value in the customer profile or brand details is invalid and must be replaced with a functional email address before you resubmit the registration.

### Possible solutions

* Update the rejected email to a well-formatted address with a valid, non-disposable domain, then resubmit the profile or brand registration.
* If the rejected field is `brand_contact_email`, use an email address on a business or organizational domain that is clearly associated with your brand. Avoid free or generic providers such as `gmail.com` or `yahoo.com`.
* If you corrected a brand contact email used for Authentication+, trigger the 2FA verification again in Console or through the 2FA Verification resource, then have the contact complete verification before the deadline in the email.
* If your business domain should qualify but the registration still fails, contact Twilio Support for review.

#### Additional resources

* [A2P 10DLC: Gather the Required Business Information](/docs/messaging/compliance/a2p-10dlc/collect-business-info)
* [Troubleshooting A2P 10DLC Standard and Low Volume Standard Brands](/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands/troubleshooting-and-rectifying-a2p-standardlvs-brands)
* [Troubleshooting Sole Proprietor Brand Registration Failures](/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands/troubleshooting-sole-proprietor-brand-registration-failures)