6.9-RC2 - Unable to pass through thumb drive to VM

[duffbeer]

I'm trying to create a Windows 10 install thumb drive to troubleshoot my friends laptop. When I plug in the 32GB Kingston USB drive it appears under Unassigned Devices, but when I go to the VM's tab and refresh the libvrt plugin it does not appear as an option to attach / detach the device.

Back under the Main tab in Unassigned Devices I've clicked the Settings button next to the thumb drive and enabled Pass Through and refreshed libvrt plugin, but still no luck.

Am I missing something of what I need to do for the thumb drive to appear? My keyboard shows up fine in libvrt.

 

Thanks