POST /api/v2/conversations/calls 400 Bad Request on initiator type

NICE CXone API & Integrations
1

Trying to trigger an outbound call from our supervisor UI using the Conversations API. The docs say initiator.type should be user, but I’m hitting a 400 with invalid_parameter: initiator.type. Here’s the payload:

{
 "initiator": {
 "id": "550e8400-e29b-41d4-a716-446655440000",
 "type": "user"
 },
 "to": [{
 "phoneNumber": "+1234567890"
 }]
}

Is the user ID format wrong or is this endpoint broken for supervisor-initiated calls?