Error when the user uses the command /publish

When the user uses the command /publish so that other users can enter the world, he should return to the IP and PORT for other users to connect.

That is not what happens. It returned the IP as follows: 0.0.0.0:PORT

The correct should be: 127.0.0.1:PORT (127.0.0.1 is an example)

This problem also happens with my friends...