---
page_type: error
code: 21738
message: "21738: Brand Registration Failure: 2FA Email Undeliverable"
level: ERROR
product: Programmable SMS
---

## Description

The verification email sent to the brand contact could not be delivered. This prevents completion of the 2FA verification step.

### Possible Causes

The recipient's email server rejected the message, or the email address is invalid or misspelled.

### Possible Solutions

Verify that the brand contact email is active, valid, and capable of receiving external email. Update the email if necessary.