Having the same issue here. Three 2014 SmartSense Motion Sensors are not reporting anything except temp.
Looking in live logging, they are reporting ‘motion has stopped’ in the IDE, but nothing about motion starting, and nothing is listed in the ‘Recently’ tab in the iOS application.
I’ve tried removing the device and re-adding it, and I have the same issue.
I emailed support and they said it appears to be working properly, which sucks, as it always takes two days to get anywhere with support since the first email is ALWAYS dismissive… or the strange email saying, ‘can we have your permission to look into this’