As stated in the title. When you are in undead form the scourge chocker is not procing any benefits at all on you when you get hit by mobs. When you take off the form it procs normally.
Since undead forms have an innate immunity to any kind of exaustions/fatigue wanted to test whether undead form was protecting you from the side effects of the proc and whether it would be a nice item for a particular build. Was kinda disappointed to see it not procing at all.