Cant get 'getting hit' sound effects to work on customs

[Verdite]

Okay I have a large problem with this, no matter how hard I try to setup getting hit sound effects to work on my custom enemies, I cant.

So I tried...

Creating an original .prf with a custom sound effect

Creating an original .prf with an existing sound effect

Using a custom model in an existing profile (ant)
All failed.

I later tried the ant on its own and it made the sound effects when I hit it. It doesnt make sense. Can someone help?