diff --git a/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMDirectConnectModule.cs b/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMDirectConnectModule.cs
index dd7b6b38..35d0a5bb 100644
--- a/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMDirectConnectModule.cs
+++ b/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMDirectConnectModule.cs
@@ -107,12 +107,20 @@ public void ClientDisconnect()
 
     public void ServerSend(int clientID, ArraySegment<byte> data, int channel)
     {
+#if MIRROR_40_0_OR_NEWER
+        directConnectTransport.ServerSend(clientID, data, channel);
+#else
         directConnectTransport.ServerSend(clientID, channel, data);
+#endif
     }
 
     public void ClientSend(ArraySegment<byte> data, int channel)
     {
+#if MIRROR_40_0_OR_NEWER
+        directConnectTransport.ClientSend(data, channel);
+#else
         directConnectTransport.ClientSend(channel, data);
+#endif
     }
 
 #region Transport Callbacks
diff --git a/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportDirectConnect.cs b/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportDirectConnect.cs
index a2ce6e31..b9a962f3 100644
--- a/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportDirectConnect.cs
+++ b/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportDirectConnect.cs
@@ -57,7 +57,11 @@ public void DirectDisconnected()
 
                 _isClient = true;
 
+#if MIRROR_40_0_OR_NEWER
+                clientToServerTransport.ClientSend(new System.ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
                 clientToServerTransport.ClientSend(0, new System.ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
             }
 
             if (_clientProxy != null)
diff --git a/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportOverrides.cs b/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportOverrides.cs
index aa2ed656..1b5b57e0 100644
--- a/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportOverrides.cs
+++ b/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportOverrides.cs
@@ -93,8 +93,11 @@ public override void ClientConnect(string address)
                 }
 
                 _isClient = true;
-
+#if MIRROR_40_0_OR_NEWER
+                clientToServerTransport.ClientSend(new System.ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
                 clientToServerTransport.ClientSend(0, new System.ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
 
             }
             else
@@ -112,14 +115,23 @@ public override void ClientDisconnect()
             {
                 int pos = 0;
                 _clientSendBuffer.WriteByte(ref pos, (byte)OpCodes.LeaveRoom);
+#if MIRROR_40_0_OR_NEWER
+                clientToServerTransport.ClientSend(new ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
                 clientToServerTransport.ClientSend(0, new ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
             }
 
             if (_directConnectModule != null)
                 _directConnectModule.ClientDisconnect();
         }
 
+#if MIRROR_40_0_OR_NEWER
+        public override void ClientSend(ArraySegment<byte> segment, int channelId)
+#else
         public override void ClientSend(int channelId, ArraySegment<byte> segment)
+
+#endif
         {
             if (_directConnected)
             {
@@ -131,8 +143,11 @@ public override void ClientSend(int channelId, ArraySegment<byte> segment)
                 _clientSendBuffer.WriteByte(ref pos, (byte)OpCodes.SendData);
                 _clientSendBuffer.WriteBytes(ref pos, segment.Array.Take(segment.Count).ToArray());
                 _clientSendBuffer.WriteInt(ref pos, 0);
-
+#if MIRROR_40_0_OR_NEWER
+                clientToServerTransport.ClientSend(new ArraySegment<byte>(_clientSendBuffer, 0, pos), channelId);
+#else
                 clientToServerTransport.ClientSend(channelId, new ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
             }
         }
 
@@ -168,7 +183,11 @@ public override bool ServerDisconnect(int connectionId)
         }
 #endif
 
+#if MIRROR_40_0_OR_NEWER
+        public override void ServerSend(int connectionId, ArraySegment<byte> segment, int channelId)
+#else
         public override void ServerSend(int connectionId, int channelId, ArraySegment<byte> segment)
+#endif
         {
             if (_directConnectModule != null && _connectedDirectClients.TryGetBySecond(connectionId, out int directId))
             {
@@ -180,8 +199,11 @@ public override void ServerSend(int connectionId, int channelId, ArraySegment<by
                 _clientSendBuffer.WriteByte(ref pos, (byte)OpCodes.SendData);
                 _clientSendBuffer.WriteBytes(ref pos, segment.Array.Take(segment.Count).ToArray());
                 _clientSendBuffer.WriteInt(ref pos, _connectedRelayClients.GetBySecond(connectionId));
-
+#if MIRROR_40_0_OR_NEWER
+                clientToServerTransport.ClientSend(new ArraySegment<byte>(_clientSendBuffer, 0, pos), channelId);
+#else
                 clientToServerTransport.ClientSend(channelId, new ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
             }
         }
 
@@ -240,8 +262,11 @@ public override void ServerStart()
                 _clientSendBuffer.WriteBool(ref pos, false);
                 _clientSendBuffer.WriteInt(ref pos, _directConnectModule == null ? 1 : _directConnectModule.SupportsNATPunch() ? _directConnectModule.GetTransportPort() : 1);
             }
-
+#if MIRROR_40_0_OR_NEWER
+            clientToServerTransport.ClientSend(new ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
             clientToServerTransport.ClientSend(0, new ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
         }
 
         public override void ServerStop()
@@ -252,7 +277,11 @@ public override void ServerStop()
                 int pos = 0;
                 _clientSendBuffer.WriteByte(ref pos, (byte)OpCodes.LeaveRoom);
 
+#if MIRROR_40_0_OR_NEWER
+                clientToServerTransport.ClientSend(new ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
                 clientToServerTransport.ClientSend(0, new ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
 
                 if (_directConnectModule != null)
                     _directConnectModule.StopServer();
diff --git a/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportRequests.cs b/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportRequests.cs
index ebdac9f7..d605f1d3 100644
--- a/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportRequests.cs
+++ b/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LRMTransportRequests.cs
@@ -116,7 +116,11 @@ IEnumerator JoinOtherRelayAndMatch(Room? roomValue, string ID)
 
             _isClient = true;
 
+#if MIRROR_40_0_OR_NEWER
+            clientToServerTransport.ClientSend(new System.ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
             clientToServerTransport.ClientSend(0, new System.ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
         }
 
         IEnumerator GetServerList(LRMRegions region)
diff --git a/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LightReflectiveMirrorTransport.cs b/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LightReflectiveMirrorTransport.cs
index 813e6166..1eaecdc3 100644
--- a/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LightReflectiveMirrorTransport.cs
+++ b/UnityProject/Assets/Mirror/Runtime/Transport/LRM/LRMTransport/LightReflectiveMirrorTransport.cs
@@ -128,7 +128,12 @@ void SendHeartbeat()
                 // Send a blank message with just the opcode 200, which is heartbeat
                 int pos = 0;
                 _clientSendBuffer.WriteByte(ref pos, 200);
+
+#if MIRROR_40_0_OR_NEWER
+                clientToServerTransport.ClientSend(new ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
                 clientToServerTransport.ClientSend(0, new ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
 
                 // If NAT Puncher is initialized, send heartbeat on that as well.
 
@@ -339,7 +344,11 @@ public void UpdateRoomName(string newServerName = "My Awesome Server!")
                 _clientSendBuffer.WriteBool(ref pos, false);
                 _clientSendBuffer.WriteBool(ref pos, false);
 
+#if MIRROR_40_0_OR_NEWER
+                clientToServerTransport.ClientSend(new ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
                 clientToServerTransport.ClientSend(0, new ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
             }
         }
 
@@ -355,8 +364,11 @@ public void UpdateRoomData(string newServerData = "Extra Data!")
                 _clientSendBuffer.WriteString(ref pos, newServerData);
                 _clientSendBuffer.WriteBool(ref pos, false);
                 _clientSendBuffer.WriteBool(ref pos, false);
-
+#if MIRROR_40_0_OR_NEWER
+                clientToServerTransport.ClientSend(new ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
                 clientToServerTransport.ClientSend(0, new ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
             }
         }
 
@@ -373,7 +385,11 @@ public void UpdateRoomVisibility(bool isPublic = true)
                 _clientSendBuffer.WriteBool(ref pos, isPublic);
                 _clientSendBuffer.WriteBool(ref pos, false);
 
+#if MIRROR_40_0_OR_NEWER
+                clientToServerTransport.ClientSend(new ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
                 clientToServerTransport.ClientSend(0, new ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
             }
         }
 
@@ -390,7 +406,11 @@ public void UpdateRoomPlayerCount(int maxPlayers = 16)
                 _clientSendBuffer.WriteBool(ref pos, true);
                 _clientSendBuffer.WriteInt(ref pos, maxPlayers);
 
+#if MIRROR_40_0_OR_NEWER
+                clientToServerTransport.ClientSend(new ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
                 clientToServerTransport.ClientSend(0, new ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
             }
         }
 
@@ -410,7 +430,12 @@ void SendAuthKey()
             int pos = 0;
             _clientSendBuffer.WriteByte(ref pos, (byte)OpCodes.AuthenticationResponse);
             _clientSendBuffer.WriteString(ref pos, authenticationKey);
+
+#if MIRROR_40_0_OR_NEWER
+            clientToServerTransport.ClientSend(new ArraySegment<byte>(_clientSendBuffer, 0, pos), 0);
+#else
             clientToServerTransport.ClientSend(0, new ArraySegment<byte>(_clientSendBuffer, 0, pos));
+#endif
         }
 
         public enum OpCodes