Telnyx incident
Elevated MMS Failures for 10DLC 501(c)(3) Campaigns
Resolved after 21 hours 35 minutes, on September 22, 2026.
Our downstream partner's fix for MMS messages from 10DLC senders on 501(c)(3) tax-exempt campaigns being falsely rejected with error 40008 has been confirmed. Error rates have remained at normal levels throughout the monitoring period.
Update timeline
- investigating Sep 22, 2026, 10:13 PM UTC
We are investigating an elevated rate of MMS send failures (error 40008) affecting 10DLC senders assigned to 501(c)(3) tax-exempt campaigns. Not all traffic in this segment is affected; we are working to identify the exact scope. SMS 501(c)(3) traffic is not impacted as well as SMS and MMS traffic on normal 10DLC routes.
- monitoring Sep 23, 2026, 04:15 PM UTC
Our downstream partner has implemented a fix for an issue causing MMS messages from 10DLC senders on 501(c)(3) tax-exempt campaigns to be falsely rejected with error 40008. Error rates have returned to normal levels since the fix was applied. We are currently monitoring live traffic.
- resolved Sep 23, 2026, 07:48 PM UTC
Our downstream partner's fix for MMS messages from 10DLC senders on 501(c)(3) tax-exempt campaigns being falsely rejected with error 40008 has been confirmed. Error rates have remained at normal levels throughout the monitoring period.
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