I'm mkaing an smp with my friends using this mod and i got it all working, but i needed to add a couple things in creative. After being satisfied with that, my origin just didnt work, i picked elytrian and yeah. nothing happened, I tried giving myself an orb of origin but it just disappeared from my inventory whilst switching to survival, and /give didnt work either, it just said it didnt exist. It's probably me being dumb, if it is, any help?

it might have been that i started using a craftbukkit server jar as well, so yup i was just being dumb, is there any way to get bukkit and fabric on the same server?

I'm not sure, but in my Discord server I heard of people talking about Paper, which apparently combines Fabric with plugin frameworks such as Bukkit.
As I said, I'm not sure, but you could try looking that up to see if it's what you need.
Closing this issue now. :) Join the Discord if you need any more help!