Unlike skills such as Shieldwall, Shieldbash, Spearwall, Riposte, etc., which are selfcast abilities all having sounds, Taunt is silent.
What is a Taunt without sound? Offensive hand gestures? Or maybe dragging down your pants to show your enemies something inappropriate?
Even Orc’s roar and Goblin’s commands have sounds!
If it’s not working – fix it, if you had no plans for it to have a sound effect, please reconsider.