hi
i just downloaded PermissionsEX Plugin to my server
and all permissions working well
But the prefixes not working
and this is the permissions string
groups:
Member:
options:
default: true
rank: '7'
prefix: '&0[&eMember&0]'
weight: '1'
permissions:
- modifyworld.*

Be sure your file follows this example.

Be sure you have a chat management plugin on the server. (Most people run Spigot servers, so they use EssentialsX for all of the basic permissions, and EssentialsXChat (plus Vault) handles their prefixes.

I'm guessing this problem is resolved since the OP has not responded in more than a week.