Not aware of a Zigbee repeater but perhaps something is acting as one.
I think I am going to connect the Ikea bulbs to an Ikea gateway and double check that they all have fully updated firmware before getting the ladder out.
Not a great start to using the Hubitat. Was going to migrate over from SmartThings hub. Was sold on the local vs cloud concept. Also thought it might be a more reliable and solid platform. It certainly has a huge amount of configuration options and tweaks that can be applied. Little point in having that amount of control if devices cannot reliably or consistently connect to it.
All I did was put the bulbs in pairing mode (power them off and on 6 times quickly) and Hubitat picked them up immediately. Mine work fine with the Generic ZigBee Bulb driver, but I don't have any control over the color temp unfortunately until I find a driver that supports that feature.