All your LIFX bulbs are on the same network (subnet) as your Hubitat bulb.
That multicast is not filtered between the wired and wireless portions of that network.
If you have a mesh network, that multicast is properly routed between the mesh points and "base" station.
AFAIK, all the Hubitat built-in LAN integrations depend on the device and the hub being on the same subnet. In addition, for discovery, many of them - like LIFX and Bond rely on multicast. So network-specific issues in routing multicast adversely impact discovery.
Tagging @bcopeland to correct any inaccuracies in what I've written.
Good idea. I disabled all routers except main one. Ensured the bulb was working after reset and it still isn't appearing after refresh in lifx Integration.
Odd
I may need to add it with Rob's app just this specific bulb.
I had a problem with one of my bulbs. I disconnected it from the cloud in LIFX and added it back in - that seem to have resolved my issue (for today at least).