Need help with Pex prefixes

Hi me and my friend have been trying to set up pex on our pixelmon server and we have made some headway but have got stuck at our prefixes. We have all of our groups set up but the prefixes do not appear

Servers running sponge 577 anything at this point would help a lot thanks!

For PEX Prefixes to work you also need a Chat Plugin like FetherChat

If you already have a Chat Plugin, ask @zml