Is there a way to cause vanished players to still take damage if another player hits them?

I think I was maybe a bit vague about what I meant.

Example: I vanish myself. I have toggled off damage-in and damage-out(so that "damage prevention" is turned off), so I should, theoretically, be able to take damage. However, when I /vanish myself, and another player tries to hit me while vanished, no damage is dealt.

Below is the link to my PEX file:
PEX permissions.yml - https://hastebin.com/ugozozuzej.vbs

The client trying to attack you doesn't know you exist, so it can't tell the server it's hitting you, so the server can't decide to cause damage.

Yes, use the vanish.preventincomingdamage permission.