My hall light has a 3 wire setup.

1 natural 

1 load

1 traveler

I am having trouble wiring up the hs210 system. I have verified the correct load and traveler wires.

One switch is able to connect to my WiFi but instantly shuts off when you press the power button.

the other switch has The circle light and the WiFi light slowly blinking but is not responsive.

Can anyone tell me what the issue is here? Does the HS210 only work with a 4 wire setup with 2 traveler cables?