Unable to pair Tradfri E12 600lm bulbs

[GSzabados (Gabor Szabados)]

Could be, what channel is your zigbee mesh on? You can read it from the IDE.
When did you bought the bulb? You might want to get a IKEA hub to update the firmware.

A few things to consider:

SmartThings Motion Sensor won't re-connect after battery change

@mross127 It’s possible that another device on the network is causing problems preventing the device from joining. The GE Link bulbs and previous generation of OSRAM/Sylvania and bulbs were especially known to cause problems with other devices. If you have any of those devices I would suggest powering them all off temporarily while you try to join the sensor. If you have any of the OSRAM/Sylvania bulbs it would also be a good idea to make sure they are on the latest firmware and updating them if they are not by following the instructions here: https://support.smartthings.com/hc/en-us/articles/215394303-Zigbee-OTA-firmware-updates.

What's this in a device's event log, something new? (x device is a other of x device?)

@BroderickCarlin & @tpmanley Honestly, this is amazing! The living proof of the shitty OSRAM bulb firmwares. 3556 Transmit Failures vs Total Messages of 5947. I don’t know that was it deployed with the new beta Hub firmware or is it some back-end change, but it is awesome! I would love to see it on a map too, but I guess it is not so far away. Thank you very much for the hard work! manufacturer: OSRAM meshInfo: {“route”: [], “metrics”: {“totalMessages”: 5947, “transmitFailures”: 3556, “duplicateMessages”: 1, “lastLQI”: 254, “lastRSSI”: -80, “lastResetTime”: “2020-02-13_00:14:20”}, “updatedTime”: “2020-02-17_15:58:24”} model: LIGHTIFY A19 Tunable White

IKEA Trådfri

@Geoffs Zigbee HA vs. Zigbee LL Some comments explains why some Tradfri Drivers are not working with Zigbee channel 24. Update: I have just read your question again.