HITL error replaying to facebook massenger conversation

throw an error when trying to reply to a facebook messenger conversation through the HITL module:

HTTP (post) URL https://graph.facebook.com/v3.2/me/messages

Received "(#100) Invalid keys "agent, preview" were found in param "message".. [object Object]"

Request failed with status code 400

is someone having the same problem?

Is there any plans to make messenger chats show up in the HITL module?