60533: SNA Carrier Header Error

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.

• 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.

• 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.

• Verify Silent Network Auth Overview
• Best Practices for Verify SNA Error Handling
• Verifications API Reference