Hitting a wall with the Genesys Cloud Outbound API. Trying to create a contact list via POST /api/v2/analytics/outbound/contactlists using a signed S3 URL that works fine in a browser. The payload is minimal, just name and the URL. Getting a 400 with INVALID_VALUE but no specific field details in the error body. Checked the docs, seems standard. Anyone else hit this silent failure on the contact list endpoint?