What’s the correct endpoint to push custom participant attributes to a live voice interaction for tracing? I’m hitting PATCH /api/v2/conversations/calls/{conversationId}/participants/{participantId}/attributes with a JSON body containing the trace ID, but I’m getting a 409 Conflict.
{
"attributes": {
"otel_trace_id": "abc123"
}
}
Is this endpoint disabled for active voice channels?