Armor of Intrigue's pretty sick, not gonna lie, but if you're anything like me you'll want to put your own custom enchantments on it. Presumably the original author of that mod, Patobek, figured the same thing, which is why he released a version of the esp that contained unenchanted versions of that armor. Unfortunately, he forgot something critically important: Making the armor actually enchantable. I found out the hard way while trying to enchant the set I just made, and promptly saved, quit Skyrim, then opened Creation Kit to fix the issue.

Then I discovered that, thanks to whatever effery Patobek's team used to make the modular equipment (picks, satchels, etc.), they're completely incapable of being enchanted even with my fix, so I'll be looking into that for the next iteration. The main armor (cuirass, hoods, boots, gloves) still works, though.

Edit: I've discovered a fix via another mod I will link below, called "No enchantment restrictions." It works by essentially making all keywords enchantable through SKSE, which somewhat renders the other option obsolete. Therefore, I've included that SKSE plugin with the latest version of the mod.

IT GOES WITHOUT SAYING YOU NEED ARMOR OF INTRIGUE IN ORDER FOR THIS TO WORK.
GO GET PATOBEK'S MOD, THEN COME BACK FOR THE ESP.

Link to Patobek's Armor of Intrigue: https://www.nexusmods.com/skyrim/mods/36875/

Link to one of my personal favorite handy enchantment mods: https://www.nexusmods.com/skyrim/mods/15884/

Link to "No enchantment restrictions:" https://www.nexusmods.com/skyrim/mods/40425/?