Outbound contact list POST returns 400 INVALID_VALUE

Stuck on a 400 error when trying to create a new outbound contact list via /api/v2/analytics/outbound/contactlists. The JSON payload looks valid but the response body says INVALID_VALUE for the name field, even though it’s a simple string.

{
 "name": "Test_List_001",
 "description": "Initial import test"
}

I’ve tried changing the name to avoid special characters, but the error persists. Is there a hidden validation rule or schema requirement I’m missing for the initial POST request?

Thanks.

have you tried adding the outboundEmail and outboundPhone fields? the api rejects the payload if those aren’t present, even if they’re null.

• required fields in outbound contact list schema
• outboundEmail vs outboundPhone validation
• /api/v2/analytics/outbound/contactlists documentation