I assume youre talking about the royal authority combo, or do you mean Phalanx either way Once a target is hit with confetti, they get a debuff called sacred claim which heals you or your allies 2k per attack, you should be able to see it in the battle/attack log(or whatever its called) if you're not seeing it or if it's not happening then might be a bug but tbh the healing is a bit minimal so maybe its just not noticeable