With the latest Parallels update - 11.2.1 (32626), I find that in order to my HP Officejet 6700 from Mac to Windows 10, I have to not only go to Devices and select the Officejet, but I then have to power down and re-start the HP Officejet, or disconnect it and reconnect it. Going from Windows 10 to Mac is fine and I don't have to re-start the device.