The MOT is the first generation and does not work with SmartThings.
With Iris zigbee devices, you want the ones that are in the purple boxes (not the clear clamshells) and where the user guide specifies “zigbee home automation 1.2” which is the same profile that SmartThings uses. If it just says “zigbee” it might use a different profile and not be compatible.
These are sometimes called Iris first generation (zigbeedevice is not compatible with smartthings) and Iris second generation, but the boxes aren’t labeled that way.
The Iris Z wave devices mostly all work with SmartThings regardless of first or second generation. The issue only comes up with the Zigbee ones.