Bone Barrier & Immortal Ambition

I'm trying out the Holy Relic of Conviction build and wanted to try mixing Bone Barrier with Immortal Ambition to get ES leech from minion damage when my life is full. That doesn't appear to be working, nor do any other sources of life leech. I've tried leeching when life is full with and without blood rage, I've tried Life Gain on Hit support (realizing this is not leech, but it would help my health stay topped up to enable other leech mechanics), but nothing seems to be leeching ES when my life is full. I have no reserved life, but I assume I'm doing something wrong. I'm just not sure what. Can anyone point me in the right direction?

POB: https://pobb.in/A1CBdsOcZv5u

Edit: this seems to be working when I'm testing now.