Disc brake adapter too close to rotor
It's not the hub's fault unless somehow its axle hardware is put together wrong or it's otherwise not putting the rotor in the right spot, but that would be a weird problem, whereas forks and frames with the issue you're having are an unfortunately common one. Step one could be downloading the IS disc mount standard and confirming it's the fork's fault.

It appears the fork tabs are unfaced. It's possible that simple facing, or even just sanding off the powder/paint, could buy you the space to make it work.

If not, the main option to make this physical combination of parts work, presuming there's adequate material for it, is file off some material from the tabs and then finish by facing it again (don't try to do it all with a facer). Either that, messing around with filing the washers (might actually be a better approach if they're what's seeming to invariably hit first), or a different brake that might have marginally better clearance, or get them to send a less borderline defective fork.