Being random consumer hardware I got for free from someone suppose I shouldn't be too surprised. I will try by disk then and see.It's all just PCIe devices. Indeed no solutions yet, but a common theme hardware that does not play nice with passthrough.
Unless I can find reports on the internet that people has success with passthrough of a device, I assume that it will not work (and buy something else). But I wish you the best of luck in this endeavor.
Here are some posts about disk passthrough: this thread and this thread. (I'm not sure if you are seeing my edits of earlier posts.)
No I did not see the edits at all. thanks for mentioning it. I will check out those threads and try by disk instead.
EDIT: Or try another M.2 slot? Maybe it's different depending on whether the PCIe lanes come from the CPU or from the chipset.
This board only has one m.2 slot so sadly not a option.