Can't pair Xfinity XHK1-UE keypad

I installed the device handler on my samsung smartthings hub and put the xhk1 in pairing mode; the green led in back flashes three times but the new samsung smartthings app does not see it. i tried pairing it with a generic z wave device but it doesn’t pair. i also tried the qr code in back but no luck. Does anyone have any ideas on how to get it setup?