Guest API /api/v2/webmessaging/messages 403 error

Hey all,

Trying to build a custom chat UI that bypasses the standard widget. I’m using the Guest API to create a session and send messages directly. The session creation works fine, but when I POST to /api/v2/webmessaging/messages with the session ID, I get a 403 Forbidden.

Here’s the payload:

{"sessionId": "abc-123", "message": {"text": "test"}}

The headers include the Bearer token. Any idea why it’s rejecting the request?