[arch-general] usbguard

[Frank]

Good evening,

I'm trying to make usbgard work. I created the initial rules set with
usbguard generate-policy > /etc/usbguard/rules.conf and started the
usbguard.service. 
Now I testing it with a USB flash drive but am failing to make it work.
The drive is plugged and usbguard list-devices gives the following
output:
19: block id 058f:6387 serial "50624E36" name "Mass Storage" hash "icy/i6K1xnkICYPmiNNwJ18cmu5GqfsHSjCGuC5WIXg=" parent-hash "oDU77vx1EsfYlDoXkU7iWjsvmBNCDNTcCHp/V0hIFXc=" via-port "2-1.2" with-interface 08:06:50 with-connect-type "hotplug"

However usbguard allow-device 058f:6387 throws the following error
message:
IPC ERROR: request id=1: Device lookup: device id: id doesn't exist

lsbusb shows the device with the same id:
Bus 002 Device 004: ID 058f:6387 Alcor Micro Corp. Flash Drive

So what am I doing wrong here?

Thanks Frank