We have enabled default template for Unautorized USB Access -
However it is not showing an error message when the device is plugged in
The default template only configures "Portable Device" and "Removable"
Make sure you check the type of USB Device.
In this case, it was a Fixed Device (removable hard drive) which is not part of the default setting.
Browse to Remote > Logical Disk > Type > Any of
And enable the "Fixed" option
Unauthorized USB Access Template is not applying properly -