Hi guys there is the solution right here...
https://github.com/pimox/pimox7/issues/48#issuecomment-1065759910
First in the graphical interface of the VM --> "Hardware" you have to erase the usb passthrough
In the host open the config file of your VM:
cd /etc/pve/qemu-server/nano 100.conf
at the end add:
args: -device qemu-xhci -device usb-host,vendorid=0x1cf1,productid=0x0030
You have to replace vendorid and productid with yours... you can find it with the command "dmesg" in the host.
And now, in your VM when "lsusb" the conbee appears... !