We've had multiple reports of users having issues with pairing their IKEA TRÅDFRI bulbs. Here is some useful information:
- Have you properly reset your bulb? If not, follow this video: https://www.youtube.com/watch?v=mJm9YpPrGzk
- Still not working? Try moving the bulb closer to the gateway. IKEA bulbs have a very short range during pairing and this might lead to the gateway not finding the bulb. Move the bulb within 3 meters of the gateway with a clear sight before retrying.