I ran into an issue where I wasn't able to use fill recipe while in multiplayer for mods that require advanced integration, but could while in singleplayer.

In my case, it was sophisticated backpacks. Which threw a weird error every time I tried to use fill recipe server side.

Received invalid discriminator byte 14 on channel sophisticatedcore:channel

Anyways, I spent like 3 hours looking over this before realizing the server didn't have JEI so didn't know what the client was talking about.

If this is a JEI recipe fill handler, the onus is on JEI to detect this. EMI can generally handle being not installed on the server itself.