@KurtK if you have multiple sockets in one fixture, try adding back incandescent bulbs one at a time. I have that issue with old Heath-Zenith motion sensing switches.  They won't work with 3x3watt LED bulbs or compact fluorescent) but they will with 2x3w LEDs + 1x20w halogen.  Come to find out the switch is rated 30w minimum.  It still works at 26w, but not at 9w.

I've tried to find the minimum current spec on the equivalent TP-Link motion sensing switch with no luck.  I suppose I could just roll the dice, but it's a lot of work when the upside is only 17w.  Be nice if they published specs.