POST /api/v2/conversations/{conversationId}/cobrowse returning 405 during automation

Trying to kick off a cobrowse session from our internal dashboard script.

Problem
The admin UI handles cobrowse fine, but the backend automation keeps choking. We’ve built a job to trigger it via the Conversations API during voice transfers. It’s failing hard.

Code

POST /api/v2/conversations/{conversationId}/cobrowse

Error
Returns a 405 Method Not Allowed. Payload is just empty braces.

Question
Does the endpoint require a specific interaction type header or am I missing a binding? The docs skip the exact JSON schema for programmatic starts.