It means they’re either globally disabled or turned off on each of your individual displays. You would normally expect to see some dots or letters underneath Email Alerts to show the status of each monitored display (from memory anyway).
Global alerts were turned on, but individual display setting was not. I changed it to YES on the display. Tested, same result. I rebooted the server just to see and still same result.
Email Alerts
Tidy Logs
Done.
Tidy Stats
Done.
Wake On LAN
Done.