Unknown or incomplete command

I have Distant Horizons 2.3.3 installed on my client and also in my 'mods' folder for the server itself. I can't use any commands for dh but it is showing /dh when i type 'help' but anytime i go to type a command it says 'Unknown or incomplete command' I have included a screenshot. I have read the server owners wiki section 2 times,and I'm not sure if I'm missing something simple.
Screenshot_2025-04-20_151006.png
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