Switch

Hello, I took advantage of a local promotion and bought the last two Cync switches without neutral wire available at the store. I installed and configured them following the instructions, and everything seems to work fine when I choose the option that says the switch will control LED lights. The lights turn on and off at the touch of the button as expected, but when I choose the mode to control Cync lights, the lights don't respond to the touch. I have the impression that I went straight through some curve in the road, but I don't know where. What could I have done wrong? Note: it's a garden post with 3 Cync lights, and I used the adapter on one of them. The lights and the switch are in the same group. Thank’s !