World Border config for SMP

I need some help with setting up the server's worldborder for the SMP server kickoff and need to use the native minecraft commands for worldborder (center/set/get you know'em) but I am running a weird server config that , I guess doesnt allow me.
I am running forge arclight 1.16.5 with the essentialsX plugin any ideas on what could cause worldborder to break?
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