Possible Cause #1
IHC is not enabled on the Eyewatch display.
Follow the instructions in the Mobileye user manual to enable the IHC
Possible Cause #2
Driving area too built up
IHC only turns on the high beams if the following conditions are met: It is dark outside. There are no vehicles in front of you within 400m. There are no oncoming vehicles within 800m. There are no street lights. You are not in a built-up area. You are driving at at least 30km/h.