I know your following a Substance discussion thread over on the iClone forums that I started. I really like the Substances you make, but iClone is tempermental with them. It seems iClone needs the "base" texture mapped to the "diffuse" output. Not sure if I got that right, as I am not a Substance Designer user. That's what another iClone user noted, and was able to get working.
Here is his reference to it:
I wish there was a forum here, as this iClone issue shows up with every Substance I've tried downloading from this site.
If something is made for Physically Based Rendering, it will use the Albedo slot for the colour map. If you want to use a PBR material in a non-pbr engine, you'll need to adjust the textures, and the result will not be the same.
If iClone *does* have a PBR engine, they need to read the colourmap from the Albedo, and you should request they change this.
To make matters more confusing for everone: This slot is called 'Base Color' in Substance, haha. Base Color and Albedo are the same. 'Diffuse' is a name generally used for older rendering technology.
The guys on the substance forums are usually quite fast with replying, maybe they can shed some more light on this :).