Ikea is not using inbound Zigbee group messaging anymore.
In the last one year Ikea provided OTA updates for almost all of the old Zigbee devices, so now everything is working with Hubitat! This includes the old on/off button (E1743), the 5 button remote controller (E1810), the motion sensor (E1745), etc, etc..
There are several community drivers that support IKEA Zigbee devices, I can highly recommend these :
