The following ancient echantments don't work:

Effiency
Looting
Knockback
Sweeping
Umbreaking
Fortune
Respiration
Swift Sneak
Depht Strider
Feather Falling
Soul Speed
Power

They don't do anything; it's as if no enchantment is applied to the armor/weapon/tool.

The following ancient echantments work perfectly fine:

Sharpness
Protection
Feather Falling

I have tested this mod completely alone (except for its dependencies, of course).

I downloaded it from the CurseForge launcher.

If you need any extra info just ask.

Expanding on this, I tested under the same conditions (I also downloaded from curseforge launcher and only used this mod + dependencies)

Not working - Unbreaking, Looting, Knockback, Fire Aspect, Sweeping Edge, Efficiency, Fortune, Thorns, Respiration, Swift Sneak, Depth Strider, Frost Walker, Soul Speed, Lure, Power, Punch, Loyalty, Riptide, Quick Charge, Piercing

Working - Sharpness, Smite, Bane of Arthropods, Protection, Blast Protection, Fire Protection, Projectile Protection, Feather Falling, Impaling

In the 20 minutes i tested Luck Of The Sea, I couldn't conclude if it is or isn't working.
Not too familiar with enchantments in mods, but it seems like only the enchantments that directly increase/decrease damage dealt/taken are working, excluding Power

I've identified the issue, seems the Mixins that enable the functionality weren't loading on Forge. I'll have a patch out soon