I found an Issue, Prefix is not showing IF using MySql to save user data, prefix is working fine when switched to YAML, here is my config, https://pastebin.com/BN0LkPNA

The only reason why it wouldn't show is if the data is different in each storage type.

Remember it doesn't move over automatically when you change your config around.

ohh ok, Is it possible to only sync the user rank, not the permissions?

No, a users "rank" is stored in their permissions.