DUO SMS and MMS Delivery Delays for AT&T
From DUO - The issue regarding MS and MMS Delivery Delays to and from US AT&T on our deployments is fully resolved, and all services are now fully functional.
From DUO - We have implemented a fix that has resulted in stable success rates. We will continue to monitor the issue and will post any updates when the incident is considered fully resolved. Please check back here or subscribe here for further updates.
From DUO - We have detected an issue with SMS delivery for the US region with AT&T, and we are currently investigating the issue.