Every promotional SMS sent in the UAE must carry a specific prefix before the sender name or the message will not be delivered. The prefix is "AD-" and it has been mandatory since November 3, 2020, under TDRA regulation. A sender ID registered as "ACMELOGISTIC" cannot be used for promotional messages. It must be registered and submitted as "AD-ACMELOGISTIC." A sender ID without the "AD-" prefix will not be approved for promotional use, and promotional messages sent without it are likely to fail or be blocked at the carrier level. Most teams building UAE programs for the first time discover this requirement at sender ID registration, not during planning.