USB Keyboard isn't listed in the device manager

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Hi,
I’m trying to run Keyboard emulator application.
After initialize the USBClientController as a keyboard,

USBC_Keyboard kb = USBClientController.StandardDevices.StartKeyboard();

sometimes the device doesn’t recognized as a keyboard (under DeviceManager > Keyboards), and also doesn’t recognized as any device.

Any suggestions how to solve this issue?

Thanks.