Marketmen

I did, it is still not working

I used this video and it does not work on the server, I have turned allow-piston-duplication to true on paper.yml and it still does not work anyone have a solution to this?

I've tried this, here is the video I used to make the cannon, but it still doesnt work

I've build a ancient debris tnt miner wich uses a tnt duplicator but it does not work, Ive tested in singleplayer and then it works fine but not on the server

I Have tried, and it still doesnt.

I've tried looking at many forum posts, but I am OP and when I type /seed it doesnt show anything, can anyone help with this since im trying to find a slime chunk and this is frustrating.