Client Automation 14.5 CU1 or CU2
With CU1, CAF Reboot/Logoff dialogs will be displayed as Windows Toast notifications.
See this documentation for more details :
It is possible to disable Toast Notification by settings this on configuration policy applied on computers :
DSM/Common Components/CAF/General/CAF Dialog: Enable Toast Notifications = False
With this settings legacy dialog box (cfCafDialog.exe) will appear again
Windows Notification may be disabled on the computers.
In this case this setting should be applied in order to get the reboot dialog box displayed.