We've created a tool that is integrated with Canvas using LTI Advantage. Within the tool teachers can leave comments on assignments and we are sending these comments back to Canvas via the Assignment and Grades Service in LTI Advantage. The comment is being sent and received just fine, but when viewing the comment within Canvas there is no commenter. It just says it was from "Someone". See the attached screenshot.

Is there someway to send the name or user id of the teacher who left the comment on the submission? Something like an LTI Advantage extension or custom property?