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As per Microsoft's USB debug page, you must launch WinDbg in an elevated process in order to install the USB driver.

Having done that, I still receive this error message:

Failed to copy USB device driver inf. The debugger must be run elevated for the first use of this transport. Error 0xE0000247.

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You may have an unsigned USB debug driver eg: from preview build of WinDbg / driver tools for Windows SDK.

The error message is no doubt a catch all for "failed to install inf" for any reason. Not informative for those with non permission related failures (you correctly ran Windbg as Admin)

Solution: Reboot with "Disable Driver Signing Enforcement" eg: https://windowsreport.com/driver-signature-enforcement-windows-10/

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