AT&T RCS Messages are Failing With 403 HTML Error

Incident Report for Twilio

Resolved

This incident has been mitigated, for further updates relating to this please see incident: "SMS and RCS Delivery Failures on AT&T Network".

Posted Dec 11, 2025 - 02:25 PST

Investigating

Our engineers are investigating an issue where AT&T RCS Messages are failing With 403 HTML errors. We expect to provide another update in 30 minutes or as soon as more information becomes available.

Posted Dec 11, 2025 - 01:45 PST

This incident affected: PROGRAMMABLE MESSAGING (RCS Messaging).