There are two ways to view who is logged into a managed endpoint:
1.Click 'Devices' > 'Device List' > 'Device Management' > 'Logged in user' column
2.Click 'Security Sub-Systems' > 'Antivirus' > 'Device List' > 'Logged in user' column
Click the icon to copy the username to clipboard.
Note. The logged-in user is not necessarily the device 'owner', the person to whom the device is assigned in Endpoint Manager.