Trigger Hue Light via Node Red Rules does not work

I have set up a few rules in not red to contol some lights via the bigtimer node. When I trigger wall plugs they do switch on or off at the defined time.
But it is not working with my HUE lights. I did chose them via the entity-id field in the “call service node” by chosing the one I want. But the do not switch on or off at the defined time. Is there anything I have to take care of by using hue lights?
THX!