Perfixes Don't work at all, No matter what plugin i try ( version; 1.12)

Hey, For some reason When i try to set prefixes in my server, no matter what plugin i use, I tried almost everything In aternos, Prefixes don't work, I went from Pex to LuckPerms and Aquatic Perms and so much more, I have no idea what to do, And Prefixes just Don't work, Is there anyway a Plugin could be causing this? And I'm pretty sure it's not about my server either, Cuz I even do it on other servers, i tried it on 5 Different Servers of my friends' And it didn't work, Please Help me.

Nvm, I've sorted The Problem, I just forgot to Get vault.