Plugins sometimes override default Minecraft commands. And just like mods, each plugin has its own namespace from which you can execute its commands. Minecraft also has its own namespace with all of its default commands. So if you have any plugins installed on the server, try running the command from the minecraft namespace:
Me and a few friends started a minecraft server and are having trouble with all commands that contain nbt data tags
Example:
/give @p minecraft:diamond_sword{display:{Lore:["\"A legendary weapon\""]}}
Error: Unknown item name:minecraft:diamond_sword{display:{lore:["\"a
It looks like a plugin issue to me.
Plugins sometimes override default Minecraft commands. And just like mods, each plugin has its own namespace from which you can execute its commands. Minecraft also has its own namespace with all of its default commands. So if you have any plugins installed on the server, try running the command from the minecraft namespace:
Command block engineer // Developer // #TeamTrees