[USB Root Hub showing "This device cannot start. (Code 10)"]

@takkkkkkk did you ever figure out the issue? I have the same card and I am noticing the same behavior. It's available to passthrough, I see it in the Device Manager on the Windows 10 VM, but any devices I connect to it are not recognized.

[fortytwo - unRAID X399 build]

On 11/16/2018 at 10:50 AM, jordanmw said:

Finally got my issues solved- since I had no slots for an extra USB card- I used a U.2 to plx PCIEX4 slot and got an allegro 4 controller card.  Now I just need to pass one controller through to each machine. Had some bios changes that allowed me to enable it with unraid and I am off to the races!

Can you link the U.2 to PCIEX4 riser or whatever you purchased? I am about to work on a build almost exactly like yours. Just needed to solve the 4 separate controllers for the 4 gaming VMs. And did your case have enough expansion slots for the USB controllers?