Creation of USB qube for Yubikey fails

sudo qubesctl state.sls qvm.usb-keyboard from USB qubes | Qubes OS fails:
tmp.log (8.0 KB)

sys-sub should soleley created be created to work with a Yubikey (EDIT: ultimately to be used as a smartcard w/ gpg). Otherwise the USB keyboard and mouse should not be affected (sys-usb were deactivated on Qubes 4.1 installtion). Feasible?

I find it hard to get a grasp on sys-usb: how it interacts, how many devices etc. - for beginners an overview graph with just a few bullet points to avoid TLDR would help. Thank you.