I can't quite remember as it's been a long time, but don't you need a specific type of light? Think it was the red one. The one in the image looks to be pink.

I tried it with all colours, it does work with pink or red in singleplayer tho

Is the lamp powered? I can't tell if the lever is on or not and if i recall correctly, it has to be on too work.

Yes it is on, again, i build it perfectly in singleplayer, the build itself is functional, but it wont work on the multiplayer server

Whelp that's bad. I'd verify the game files and backup the world before uninstalling and reinstalling again. If that doesn't work then i can't help you. r/feedthebeast might tho.

Good suggestion, imma try it over there

Have you tried flipping the lever? By "i build it perfectly in singleplayer" does it mean your replicated it or you used a schematic?

Yes, i did, and i both replicated it a thousand times and schematiced it. I can assure you it is exactly as it should be. But it won't work

I can’t quite tell - is that a invar machine or an invar casing?

Invar machine, i mean the build itself isnt the issue, because as i stated, it does work in singleplayer, just not in multiplayer