Analytics API: Agent utilization metrics returning null for tHandle

I’m querying the analytics API for agent utilization metrics broken down by 30-minute intervals, but the tHandle and tAcw fields keep coming back as null. The request returns a 200 OK, so the call is technically succeeding, but the data is empty. Here’s the JSON payload I’m sending to the agent status query endpoint. Any idea why the utilization stats aren’t populating?