Analytics API tHandle/tAcw breakdown by 30-min intervals

Trying to pull agent utilization metrics broken down by 30-minute intervals using the Analytics API. The /api/v2/analytics/users/summary endpoint returns aggregated totals for tHandle, tAcw, and tHold, but there’s no obvious way to force a 30-minute granularity in the request. I’ve tried setting interval to PT30M in the query params, but the response still aggregates by hour or day depending on the date range. Is there a specific parameter or a different endpoint needed to get sub-hourly breakdowns, or am I missing something in the SDK call?

GET /api/v2/analytics/users/summary?metric=tHandle,tAcw,tHold&interval=PT30M&from=2023-10-01T00:00:00Z&to=2023-10-01T23:59:59Z