When you see scan log of Symantec Endpoint Protection 14.x for Macintosh (SEP for Mac) client in Symantec Endpoint Protection Manager console - Monitors - Scan, you can see very limited information only for those client.
This may happen frequently if you install SEP for Mac Unmanaged client then convert to Managed client but may happen also if you install Managed client using exported install package from Symantec Endpoint Protection Manager (SEPM).
Symantec Endpoint Protection 14.x for Macintosh
This issue is fixed in Symantec Endpoint Protection 14.2.0.1 (14.2 MP1). For information on how to obtain the latest build of Symantec Endpoint Protection, see Download the latest version of Symantec Endpoint Protection.