---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/60534#article
headline: "60534: SNA Downstream Carrier Error"
url: https://www.twilio.com/docs/api/errors/60534
inLanguage: en
dateModified: 2026-06-08T12:04:59.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 60534: SNA Downstream Carrier Error

Log Type: TWILIO

Log Level: ERROR

## Description

This error occurs when Verify receives a Silent Network Auth verification request, but the request fails during processing because of a downstream carrier error. Silent Network Auth requires the client to invoke `sna.url` from the end user's device over the mobile network so Verify can complete the carrier-side phone number check.

### Possible causes

* The downstream carrier returned an error while Verify was processing the Silent Network Auth request.
* The Silent Network Auth flow could not be completed with the carrier.
* The client did not complete the required `sna.url` request from a device connected to the mobile network, which can prevent the carrier verification step from completing.

### Possible solutions

* Retry the verification using a channel other than Silent Network Auth for this end user, such as SMS.
* Use `channel=auto` if you want Verify to attempt Silent Network Auth first and fall back to SMS when SNA cannot be completed.
* Make a Verification Check request and inspect `sna_attempts_error_codes` to get more detail about the failed SNA attempt.
* Confirm that the client sends the `sna.url` request from the end user's device over an active mobile data connection, then retry the verification.

#### 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)