Plus the Cameras must have valid configured Events which trigger the MxMC Alarm.
This description above are relevant for all Cameras Models from X4,X5,X7 and ONE.
IF some of the cameras are not show a alarm window may the public access in the camera is enabled. The Public access must be disabled in all cameras!. Question:do you get the Alarm Snapshots in the right Alarm site bar of the MxMC?
For the M12 Camera the notification is working via a IpNotify and trigger a MxMC Remote Command to pop up a alarm window.