Achievement bug with Fortify

Cant complete the "Defence Against the Darkness" where you must land the killing blow on the Vaal Oversoul while you have the Fortify Buff active.

Buff is now called "Fortification" and maybe thats why its not working.


I tried many times with different Fortify sources:
-Vigilant Strike
-Fortify Support
-Fortify Mastery

I tried many times with 20 stacks of Fortification

same problem, tried multiple sources of fortification buff, but still cant complete the achievement :(

Like I said in the other thread, also not working on my end. :/