Why i dont get an answer from my Host in Icinga?

Question

(Bild)No Answer from Zone

(Bild)All other Services i can check

  apply Service "load" {
   import "generic-service"
   check_command = "load"
   if (host.name != NodeName){
    command_endpoint = host.name}
   assign where host.name == NodeName
   assign where host.vars.os == "Linux" && host.vars.zone == "Cluster"

When checking the Icinga service runs on the targethost I have done it exactly the same, only that I get here a result back but not with "load".

apply Service "icinga" {
  import "30-mins"
  check_command = "icinga"
  assign where host.name == NodeName
  assign where host.vars.os == "Linux" && host.vars.zone == "Cluster"