Cannot pair an IKEA LED1836G9 (solved)

Just bought 2 bulbs a switch and a movement sensor. Switch and movement sensor paired OK but cannot get either bulb to pair.

The 6 switches works in the the bulb momentarily goes off so I’m sure it is in pairing mode, it is right next to the CC2531 that I have just flashed with latest firmware, Z2M is set to permit join but never picks it up. Do I need to pair these with an end device first?

After lots of fiddling I got them to pair. I think unplugging the sniffer and plugging it back in was the final thing that meant it then paired.