I have one of the odd ball bosh motion sensors that seem to report motion using motion2 instead of motion1. I do believe the built in driver used to work, and I think it may have been modified to only report on motion1. So it basically seemed to stop working sometime over the last month or so. I moved to this custom driver and it now works again: Bosch Motion Sensor? - Devices & Integrations - SmartThings Community
It'd be nice if the built in driver could be fixed so that it works again. But i'm working fine at the moment so it's a low priority.
Darrell