---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/60533#article
headline: "60533: SNA Carrier Header Error"
url: https://www.twilio.com/docs/api/errors/60533
inLanguage: en
dateModified: 2026-06-08T12:04:59.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 60533: SNA Carrier Header Error

Log Type: TWILIO

Log Level: ERROR

## Description

This error occurs when a Verify Silent Network Auth verification reaches the carrier step but the carrier does not provide a required header for Twilio to complete the verification. Because the `sna` channel depends on direct carrier confirmation for the device's SIM and phone number, the verification attempt cannot continue.

### Possible causes

* The carrier did not return a required header during the Silent Network Auth verification flow.
* The verification was started with the `sna` channel, which requires a direct carrier network check to complete.
* In browser-based or desktop-assisted SNA flows, the end user's device did not complete the SNA URL invocation over the carrier network.

### Possible solutions

* Retry the verification with a different Verify channel such as `sms` or `call` for this end user.
* Make a Verification Check request and inspect `sna_attempts_error_codes` so you can record the failure and trigger your fallback flow.
* If you use SNA in a browser or desktop flow, make sure the SNA URL is opened on the mobile device and completed over the carrier network.
* Do not rely on channel-specific handling for this error beyond fallback. Use another verification method when SNA cannot be completed.

#### Additional resources

* [Verify Silent Network Auth Overview](/docs/verify/sna)
* [Best Practices for Verify SNA Error Handling](/docs/verify/best-practices-for-verify-sna-error-handling)
* [Verifications API Reference](/docs/verify/api/verification)