I think I see the issue--the race score is looking for the scaled skin type, but the transformative changes the skin type to regular skin, but thick.
For the next release, I've updated the race score to accept both regular skin or scaled skin types, so long as they are thick. As for the transformation item, if the skin is not regular or scaled, or if the regular/scaled skin isn't thick, the change will be turning the skin type into the usual smooth, thick regular skin. The transformation will not grow or replace scales with thick scales, at least not at the moment, but you can always get that skin type from other transformative items.