Essentials trade signs not working

I have a mc server and im trying to make a essential sign for trading, I do 4 diamonds for a shulker box and it does it correctly, but it doesnt work to other people if I dont give them op. When my friend clicks on it, nothing appears on their screen. No error text. I use luckperms, how can I make it work without giving them all op?

 

What are all the essentials trade sign perms in Lucky Perms?

 

there are none, i only put essentials.editsign

 

Try this planet Minecraft forum I found
https://www.minecraftforum.net/foru...ort/1848810-essential-trade-signs-not-working

 

Thats not my problem, i had that but fixed it, mine is different. Because people need op to use the signs and want people to use it without op.

 

Well you could op them and you could turn off almost every permission but that might not work.

 

I dont want to op them, i do not trust them because we currently have a greifer.