RingSense "try it out" returns 404? What steps am I missing?

Hi

using this page:
RingCentral RingEX API Reference | RingCentral Developers

I was trying out: “Get Recording Insights”, specifying an account id and a recordingid (both exist, I can retrieve the recording via the api), but I get:

{ "errors": [ { "errorCode": "RAH-3001", "message": "Insights not found for the provided recording", "errorDetails": { "errorMessage": "Call not found with sourceRecordId: 100827xxxxxxx and source pbx in account 171xxxxxxx" } } ] }

What are the steps I need to take to get this working?