Minecraft command bug?

So
- in Servers
2

If I want to enter a command in mycraft 1.13.1 this will not work. My colleague is on the same server and we have the same rights. Message: it is unknown command although it is the same as my colleague

can someone help me?

Ro

That's too little information.

(error) message from the console?

plugins? If available

So

It is an unknown command, although it is the same as my colleague