Functions in Front Desk Mode when in Focus and Continuous mode when minimized. The correct default scanner must be selected for Continuous mode to function.
Open the ETO Attendance application
Scanner > Options
Scanner Device ID
Select the correct Scanner from the Drop Down
If you do not know your scanner ID read more here. The information can be found in the Devices and Printers settings of your computer,
Close ETO Attendance Scanner
Reopen the application
Continuous mode should function in minimized view.