Hi Chris,
I use the following command to get a USB device on VM:
--8<---------------cut here---------------start------------->8---
qemu-system-x86_64 \
-daemonize \
-m 4096 \
-smp 2 \
-enable-kvm \
-hda /srv/virt/vm.qcow2 \
-smb /srv/share \
-M q35 \
-usb \
-device usb-host,hostbus=2,hostaddr=4 \
-net 'user,hostfwd=tcp::3389-:3389,hostfwd=tcp::445-:445' \
-net nic
--8<---------------cut here---------------end--------------->8---I'm not sure I could help you with spotting the mistake though, because I got this command almost randomly trying different flags and suggestions on the internet :-)
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