There is a carrier-partner incident currently impacting all sender types SMS services(route 2) for Mexico.
Customers may experience intermittent delivery receipt delays impacting inbound (MO) and outbound (MT) SMS via all sender types with AT&T.
The cause of this issue is under investigation at this time.
Please see the list of impacted products and/or services below and contact the Convey Help Desk with any questions. We will provide more information as it becomes available.