Bought 3 sets of exactly the same thing. I am using this [Release] Virtual Alexa Switch/Button
Works like a charm…you install the above on the IDE you call it Flood Lights (is what i did) than you go on Alexa and create 2 routines to turn your lights one for ON and one for OFF when the above switch/sensor turns on and off after that you HAVE to disable the Smarthings Alexa skill in the Alexa app and re enable it again and everything works just fine …again you have to do this last step for it to work
let me know if you need any help
Denis