CXone v2 Reporting API returning empty stats for active queues?

Trying to pull real-time queue stats to feed into my OTel spans. The goal is to correlate queue wait times with trace latency. I’m hitting GET /api/v2/analytics/queues/realtime/queues with a standard Bearer token. The request succeeds with a 200, but the items array is always empty, even though queues are live.

{
 "items": [],
 "pageSize": 20,
 "pageNumber": 1
}

Did I miss a required query param like interval? The docs are vague on the exact format for ‘realtime’.