if only he cared about the servr

What does the message say?

dough he's trying to change his prefix with /setprefix...

oh, it says it works but, when i type in chat it don budge ;/

So when you type in chat it appears with your old prefix?
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I don't know but from what I heard a moderator refreshed a player's name and then they could. You could try that.

no it says it changes to the new prefix i set, but it doesn't appear when i type in chat