Symantec Endpoint Protection (SEP) client notifications, triggered by Intrusion Prevention events for example, do not display on macOS 10.15.
macOS 10.15
Symantec Endpoint Protection 14.2 RU2
The first time SEP triggers a notification for a particular component (i.e. AV, IPS, etc.) the OS will prompt the user with the choice to "Allow" or "Don't Allow" notifications. If the end-user chose "Don't Allow" when the operating system notified them, then all further notifications from SEP will not be displayed.
In order to restore notifications for Symantec Endpoint Protection, the following steps should be applied:
For more information, refer to Apple's documentation Change Notifications preferences on Mac.