---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21737#article
headline: "21737: Brand Registration Failure: 2FA Verification Expired"
url: https://www.twilio.com/docs/api/errors/21737
inLanguage: en
dateModified: 2026-04-20T06:45:15.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21737: Brand Registration Failure: 2FA Verification Expired

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when the Authentication+ two-factor verification link or token for an A2P 10DLC Brand expires before the brand contact completes verification. To continue brand registration or re-verification, submit a new 2FA request and complete the verification within the active time window.

### Possible causes

* The brand contact did not use the Authentication+ verification link or token before it expired.
* The brand registration requires a brand business contact email and the 2FA step was not completed within the verification window.
* A new or existing public brand reached the Authentication+ step, but the contact did not finish verification before the deadline in the email.

### Possible solutions

* Submit a new 2FA request in Console or by sending a `POST` request to the Brand 2FA Verification resource.
* Ask the brand contact to complete the verification as soon as the new email arrives and before the deadline shown in that email.
* If the failed registration is for a new brand, update `brand_contact_email` in the associated `us_a2p_messaging_profile_information` bundle if needed, then trigger Authentication+ again using the 2FA endpoint.
* If the contact did not receive the email, resend the Authentication+ email from Console and confirm the address is correct and associated with your business. Do not use a consumer email domain such as `gmail.com`.

#### Additional resources

* [Troubleshooting A2P 10DLC Standard/LVS Brands](/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands/troubleshooting-and-rectifying-a2p-standardlvs-brands)
* [A2P 10DLC Brand 2FA Verification Resource](/docs/messaging/api/brand-2fa-verify)
* [Direct Standard and Low-Volume Standard Registration Guide](/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding)