The XML to be imported in MCUpdater modpacks to include Fabric is missing the side="BOTH" attribute for the Module and Submodule entries, which causes a server-side install to not include Fabric.

Mind link to the xml? I am not aware that such an xml exists 🤔

Oh it's on website, @modmuss50 might take care of that 👍 https://fabricmc.net/use/?page=mcupdater

I will take a look, its generated in some php code that im less than familiar with

@modmuss50 Any updates on this? I'm trying to use MCUpdater to manage a Fabric server, which is annoying if MCUpdater doesn't work!

Should now be fixed, thanks to asie.