The client always installs and executes using the LocalSystem account on Windows machines.
That property, “User Name”, behaves like any other Property - it’s based on what the client sees when it inspects the machine, just like the hostname, IP address, MAC address, installed software list, etc.
The “User Name” property reflecting “bi21xxxx” just means that you’re logged on to the machine. If you log off and log on with a different user account, that new account name should show up in the “User Name” property.