Make sure you only release the ON-button AFTER the LED indicator on the Hue dimmer switch turns green. During this process the lamp will flash three times and the LED indicator then turns green.
Power cycle the lamp and try once again to add your lamp by holding the remote control a little bit closer, further or at another angle from the lamp.
- LED indicator red?
Reset the Hue dimmer switch by pressing and hold the setup button until the LED on the the front truns green. Try again to add your lamps again.