API - trigger.get method - not returning desired result

[billhubb]

Good day,

I am trying to use the API to return results for a daily report that we will use for agent availability. We have a trigger setup that performs a check on the agent and should be in a problem state if not available.
For reference the trigger is looking at:

({Agent and Host Availability Template:zabbix[host,agent,available].last(0)}#1 | {Agent and Host Availability Template:zabbix[host,agent,available].nodata(600)}=1)

The exact name of the trigger is: Zabbix agent on {HOSTNAME} is Unreachable

I have the following json query written to try and pull down all triggers that are in a bad state, but whether I set the value to 0 or 1 I get no results, even though I know that the triggers are in an Ok state presently.

{
    "jsonrpc": "2.0",
    "method": "trigger.get",
    "params": {
        "output": [
            "triggerid",
            "description",
            "priority"
        ],
      "search": {
        "description": "Zabbix agent on"
      },
        "filter": {
            "value": 1
        },
        "sortfield": "priority",
        "sortorder": "DESC",
      "expandData": 1,
      "expandDescription": 1
    },
   "id": 15,
   "auth": "MASKEDFORSECURITY"
}

If I substitute the value for 0 above, I get no results as well. If I subsitute the description text above for any other trigger name I get results. Can anyone think of a reason why certain triggers could be being excluded? I'm really at a loss.

Thanks in advance.