You upgraded Symantec Endpoint Protection Manager (SEPM) to 14.3 RU8 or later.
You tested EICAR on Symantec Endpoint Protection (SEP) client but Symantec Endpoint Detection and Response (SEDR) console does not display 4123 event (Endpoint File Detection).
This issue is fixed in SEDR 4.9.0 and 4.8 hotfix4.
For information on how to obtain the latest build of Symantec Endpoint Detection and Response, see Download Symantec Enterprise Security software, tools, and patches.