---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/30553#article
headline: "30553: SMS is forced for two-factor authentication"
url: https://www.twilio.com/docs/api/errors/30553
inLanguage: en
dateModified: 2026-09-14T16:28:48.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 30553: SMS is forced for two-factor authentication

Log Type: APPLICATION

Log Level: ERROR

## Description

This error applies to both Toll-Free Verification and A2P 10DLC registration.

Programs that use multi-factor confirmations or two-factor authentication (2FA) codes must offer at least one alternative delivery channel besides SMS, such as email, voice fallback, or push notification. SMS cannot be a forced requirement for security verification.

### Possible causes

* A login or signup security page blocks the user from completing setup unless they provide an SMS-enabled phone number.
* The workflow states that text-based 2FA is mandatory with no other option.

### Possible solutions

* Update the authentication workflow to offer at least one alternative delivery method, such as an email confirmation link, alongside the SMS option.
* Resubmit once an alternative channel is available.

### Additional resources

* [A2P 10DLC Campaign Onboarding Guide](https://help.twilio.com/articles/11847054539547-A2P-10DLC-Campaign-Approval-Best-Practices)
* [Toll-Free Verification Onboarding Guide](https://help.twilio.com/articles/13264118705051)