Unable to pair Zigbee IKEA Bulb E27

Hi

I am unable to pair 2 IKEA E27 bulbs.
The devices are being found but is not being paired. I tried the different options (exchanging keys in clear) but in vain.

Also tried to change the Zigbee channel to 20 as I have seen this is the one where most users are finding success. But still not working.

Please help!