POST /api/v2/outbound/contactslists returning INVALID_VALUE

Getting a 400 INVALID_VALUE when posting a new contact list. The payload looks standard, just a name and description. No CSV attachment yet, just trying to create the object first.

POST /api/v2/outbound/contactslists
Body: { “name”: “Test List”, “description”: “Test” }

Docs say this should work. Am I missing a required field like contactListType? Error response is vague.

You’re missing the type field. It’s required and needs to be "MANUAL".

{
 "name": "Test List",
 "description": "Test",
 "type": "MANUAL"
}