Yubikey passthrough to appvm

hey,
got some troubles with my yubikey, everythings working fine in the sys-usb appvm but i set up for some websites (like linkedin or youtube) that if i want to log into my accounts i have to press my yubikey as mfa.
but if my browser is requesting this my yubikey isnt blinking (its blinking if i have to press my yubikey)
i hope you understand my problem :slight_smile:

EDIT:
sorry i forgot to say i was already trying to setup my u2f proxy as explained here: