Discover Centralite Zigbee smart switch

I am trying to pair a Centralite 3385001-RZHAW wall switch to the gateway.I have put the wall switch in unpaired mode (i.e. the blue LED blink 3 times every two seconds). When I ask the gateway to discover devices it is unable find the switch. The gateway is 3 feet from the wall switch. Smart things is able to see the switch so the problem in not in the device. The wall switch says that is HA 1.2 - so I am assuming that it should work with the gateway. Any advice ?