Can I change the ID of devices or @gopher.ny can Hubitat be smart and not sending the same device ID to HomeKit when several hubs publish to the same Home somehow?
It looks like it is just appending the device id to "HUBITAT" which will easily have duplicated IDs across multiple hubs. Looks like Homebridge does something similar.
That warning is from a third party app also, not the Apple HK app.