POST /invitees returning invalid_location_choice even when event_type.locations matches location_configuration.kind

I’m attempting to create an invitee via:

POST https://api.calendly.com/invitees

I consistently receive:

{
  "title": "Invalid Argument",
  "message": "Specified location kind is not configured for this event type.",
  "details": [
    {
      "parameter": "event.location_configuration.kind",
      "code": "invalid_location_choice"
    }
  ]
}

Event Type (confirmed via GET)

{
  "kind": "solo",
  "locations": [
    { "kind": "zoom_conference" }
  ],
  "uri": "https://api.calendly.com/event_types/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
}

Invitee POST body

{
  "event_type": "https://api.calendly.com/event_types/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX",
  "start_time": "2026-02-17T16:15:00Z",
  "invitee": {
    "email": "test@example.com",
    "name": "Test User",
    "timezone": "America/New_York"
  },
  "location_configuration": {
    "kind": "zoom_conference"
  }
}

Headers:

• Content-Type: application/json

• Authorization: Bearer (PAT)

The event books successfully via the UI, but the API rejects it.

What additional field (if any) is required inside location_configuration for Zoom-based event types?  I’m using POSTMAN to test it.

Thanks in advance.