If you are using AppleConfigurator older than 2.X you will not be able to activate supervised/non supervised devices completely if they are to bu updated to iOS10.3.X or if they are already running this version. Old Apple Configurator may be the cause here. I would try updating AC if possible.
Everytime I attempt to prepare and iPad through apple configurator, I keep getting the error message:
'Unable to Activate'.
'Unable to activate. The device failed to activate with a valid activation record.'
Description: Unknown (AMDevice Error = 2) Code: 2
Domain: com.apple.mdk.a... (I can't see the rest. It wont let me select it.)
I have turned on/off every setting that is available but no matter what, I cannot activate and nothing gets configured on the device.