Ok i have got these enchantments before but forgot to try them with one of my characters. this time i remember to try them out. & everything i have from Armor to Rings & all that. nothing these Shadow Enchantments can't be used to enchant with. ( & mind you i have all the enchanting perks. )
Whats going on is this a bug or is the items you can enchant with them so small you wouldn't think of it. can someone plz Help clear this up?

It's bugged

It can't be enchanted.

You mean Linwe's Armor?

It's enchants can't be applied to anything.

So Disenchanting Linwe's Armor is worthless? great, oh well.

Yepper. Sorry man.

Oh no problem thanks for the info. my question is if disenchanting it is worthless why do they allow you to?

They mean to let you put the enchant on stuff, but some dev probably messed up somewhere and made it so nothing can be enchanted with it.

Yeah most likely, i hope patch 1.8 fixs it.