V2/reporting/queue-stats returning empty data despite active interactions

Trying to pull real-time queue stats via GET /api/v2/reporting/queue-stats. The request returns a 200 OK, but the queueStats array is always empty. I’ve confirmed the queue is active and has conversations in progress.

The endpoint docs say to pass queues as a query param. I’m sending the queue ID directly:

/api/v2/reporting/queue-stats?queues=8f3a...-b2c1

Payload back:

{
 "queueStats": []
}

I’ve tried adding intervalStart and intervalEnd but it doesn’t change anything. Is there a specific format for the queue ID or a header I’m missing? The analytics endpoints work fine, just this real-time one is dead silent.