Speech Analytics API returning empty transcript array for voice interactions

Trying to pull the full VTT transcript via GET /api/v2/analytics/speech/text/transcripts/{transcriptId} to feed into my OTel spans. The API returns 200 OK but the text array is completely empty. Here’s the payload:

{
 "id": "a1b2c3d4",
 "text": []
}

Any idea why?