List meeting participants not working for "Live" meetings

Using: GET /metrics/meetings/{meetingId}/participants

Basically I want a list of participants in a specific meeting while it’s running.

Works great as soon as the meeting is over. But not during.
I’ve checked all the prerequisites setting ‘type’ to ‘live’, I set the scopes and I have a Business or higher license. Since it works after the meeting is over I assume the format is correct and must be a permissions issue for live meetings? I’m using the uuid for the meetingId. Although I’ve tried both the id and uuid. Response is always: “Request failed with status code 404” . As a test I end the meeting for all users and run the same query and it works. But I need it to work while the meeting is still running.

Thanks for any suggestions.