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McAfee Agent not communicating to ePO server after installation

I have recently upgraded the McAfee agent from 4.5 to 4.8 p3 and I found that all the machines got updated to new version but they are NOT communicating to ePO after installation and showing unmanaged or last communication to some old date. I then logged into couple of machines to troubleshoot and found when I manually run cmdAgent.exe \s command on cmd, the McAfee icon comes into system tray and then I do collect and sent events it starts communicating back to ePO and showing managed into ePO.

Kindly suggest here as we have hundreds of such machines.