Dude Ive read the wiki oh god , they cant change their name they got essentials.nick.changecolors & essentials.nick (I put Essentials's data to EssentialsX, Im not sure thats the problem)
Lets say my ign is Okay
I got both permission.
Even if I just type /nick &6Okay it wont work

which version are you on?

1.7.10 spigot

which version of essx

latest

pretty sure that's not a version

I am having issue with this permission too, if I give it, only that perm, directly, players can't use it, if I give basic nick perm, then they can completely rename themselves as usual

I am on latest devbuild from 4 days ago I believe

please be specific on version numbers and read the wiki.