Send Text Over Network

Hi, I am trying to get a string sent over the network so that when a player hits a button ('g') the Text object will be updated with new text. What I have so far is as follows:

 using UnityEngine;
 using UnityEngine.Networking;
 using UnityEngine.UI;
 using System.Collections;
 
 public class NTC : NetworkBehaviour {
 
     [SyncVar]
     private string broadcastMessage = "textwillgohere";
 
     public Text theText;
     
     // Update is called once per frame
     void FixedUpdate () {
 
         if (Input.GetKeyDown (KeyCode.G)) 
         {
             TransmitText ("It worked!");
         }
 
             theText.text = broadcastMessage;
     
     }
 
     [Command]
     void CmdProvideTextToServer(string inputText)
     {
         broadcastMessage = inputText;
     }
 
     [ClientCallback]
     void TransmitText(string inputText)
     {
         CmdProvideTextToServer (inputText);
     }
 }

This code is attached to an empty GameObject with a NetworkIdentity and it changes a Text object in the scene that has no NetworkIdentity (I don't think this matters). So as is, it works if I press 'g' on the client who is also the host but not if I press 'g' on any other client (called a remote client?) How can I get it so that if anyone presses 'g' the text will change? Thanks!