I have two lights to be turned on by the associated Arlo camera when it detects motion. It worked when I added the first one but when I changed it to a new light recently, it quit working. I have deleted that one and put it back in later with no results. I also added a second trip to the light that had worked before but using a different camera. It also will not trigger the light. I do get the motion alert in the Arlo app but no trigger action in Smart Things.
Any suggestions would be appreciated.
I’m sure that’s very frustrating. 
This has been reported several times in the forum. See the existing discussion thread. (The topic title is a clickable link)
People have posted multiple discussions with Arlo support. It appears to be a known issue on the Arlo side.
(The topic title is a clickable link)