DSL snippet for detecting typos

Icinga 2
1

Iam using a custom variable for sending SMS notifications, for example:

object Host "myhost" {
 ...        
 vars.sms_services = [ "uptime","temperature" ]
}

This works well, at least technically.

Typos in the service names of vars.sms_services remain unrecognized.

So I tried to create a new service on each host with vars.sms_services for detecting typos, but this doesnt work at all.

apply Service "sms_configcheck" {
 import "generic-service"
 check_interval = 2h
 max_check_attempts = 1
 check_command = "dummy"


 var error = 0
 var mylist = [ ]
 var svcarray = []
 mylist = host.vars.sms_services

    for (smssvc in mylist) {
      error=0
      svcarray=get_services(host.name).map(s => s.name)

       if ( ! smssvc in svcarray) {
            error=1
       }
    }

 vars.dummy_state = error
 vars.mylist = mylist
 vars.svcarray = svcarray

 assign where host.vars.sms_services
}

sms_configcheck is always ok, what is wrong?
tia
Timo