Couple of things needs be to checked.
1. When Eicar file is detected on the client machine. Do you see it detected in OAS scan log?
2. If yes then do you see event created in the client machine's AgentEvents folder (C:\ProgramData\McAfee\Common Framework\AgentEvents).
3. If yes then please open agent monitor window and click on 'Send Events'. Do you see events are sending to ePO server.
4. Now look at the ePO event parser log and see if the event is successfully parsed to the DB. If the event is successfully parsed to the ePO DB then you should be able to see in the ePO server.