Possible values: [lesson, tips, flux, manager-user-deactivation, manager-multiple-users-deactivation, memorize, track, ranking, default, merge, author-discussion, discussion-mention, discussion-timeline-comment, discussion-lesson-comment, new-discussion-lesson, new-discussion-coaching, new-discussion-feed, new-discussion-lesson-content, new-discussion-tips, new-discussion-timeline, add-author, invite-user-to-join-platform, send-free-email, added-as-manager, create-milestone, new-lessons, added-to-lesson-session, session-will-start, manager-user-request-reactivation]