Chat System Setup

Assets/Scripts/ChatBehaviour.cs

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+using Mirror;
+using System;
+using UnityEngine;
+using TMPro;
+public class ChatBehaviour : NetworkBehaviour
+{
+    [SerializeField] private TextMeshProUGUI chatText = null;
+    [SerializeField] private TMP_InputField inputField = null;
+    [SerializeField] private GameObject canvas = null;
+
+    public override void OnStartClient()
+    {
+        canvas.SetActive(true);
+
+        SpawnScript.OnMessage += HandleNewMessage;
+    }
+
+    private void OnDestroy()
+    {
+        SpawnScript.OnMessage -= HandleNewMessage;
+    }
+
+    private void HandleNewMessage(string message)
+    {
+        chatText.text += message;
+    }
+
+    [Client]
+    public void Send()
+    {
+        if (!authority)
+        {
+            Debug.LogWarning("Attempted to send chat without authority.");
+        }
+
+        if (string.IsNullOrWhiteSpace(inputField.text)) { return; }
+        NetworkClient.localPlayer
+            .GetComponent<SpawnScript>()
+            .CmdSendMessage(inputField.text);
+        inputField.text = string.Empty;
+    }
+}

Assets/Scripts/ChatBehaviour.cs.meta

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+fileFormatVersion: 2
+guid: 3e2cbf076f9d6ec41b63cd8c0fe4c17d

Assets/Scripts/SpawnScript.cs

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+using Mirror;
+using System;
+using UnityEngine;
+
+public class SpawnScript : NetworkBehaviour
+{
+    public GameObject chatPrefab;
+
+    public static event Action<string> OnMessage;
+
+    public override void OnStartServer()
+    {
+        GameObject obj = Instantiate(chatPrefab);
+        NetworkServer.Spawn(obj);
+    }
+
+    [Command]
+    public void CmdSendMessage(string message)
+    {
+        RpcHandleMessage($"[{connectionToClient.connectionId}]: {message}");
+    }
+
+    [ClientRpc]
+    private void RpcHandleMessage(string message)
+    {
+        OnMessage?.Invoke($"\n{message}");
+    }
+}

Assets/Scripts/SpawnScript.cs.meta

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+fileFormatVersion: 2
+guid: 6dab1be56f31ff44889b274b8f565102