Setup Execute the following query in your DB to ensure there is data present (replace your database name/prefix as appropriate): INSERT INTO `moodle`.`m_task_adhoc` (`component`, `classname`, `nextruntime`, `faildelay`, `customdata`, `blocking`, `timecreated`, `attemptsavailable`) VALUES ('mod_forum', '\mod_forum\task\send_user_notifications', '1711976400', '3600', '[\"1\"]', '0', '1711976400', '1'); Test Log in as admin Navigate to Server > Tasks > Ad hoc tasks in site administration Press Run all for the send_user_notifications task Confirm the page heading shows Run all '\mod_forum\task\send_user_notifications' tasks Navigate back to Ad hoc tasks Press Run all failed for the send_user_notifications task Confirm the page heading shows Run failed '\mod_forum\task\send_user_notifications' tasks Note the value in the Task ID column Amend the page URL manually to the following: <WWWROOT>/admin/tool/task/run_adhoctasks.php?id=<TASKID> Confirm the page heading shows Run '\mod_forum\task\send_user_notifications' task ID <TASKID>