Check that your ADT Panel is being monitored! (10 July 2019)

This issue is also being discussed in detail in the following thread, so you might want to read that one as well. That one started with a member who couldn’t complete the ADT system test, then discovered they had duplicate sensors, and then tracked everything down to the failure of the cellular module after the update.

Quite a few community members have been discussing the problems as well as the responses they have been getting from both ADT and Samsung support staff about it.

ADT Hub System Test Required/Duplicate Sensors/Cellular Module Failure (July 2019)