I found that when you add a comment/story to a task using the Asana API you can’t define the fields ‘created_by’ and ‘created_at’.
POST /tasks/task-id/stories
Well, the reason may be because of security / permissions, but if the comment has already been added to an external resource and passed through the Asana API - it must retain its real figures (creation date, author id, etc.). At least Asana users with admin right should have this possibility.
Thanks!