diff --git a/dotnet/AipsRT/Hubs/WhiteboardHub.cs b/dotnet/AipsRT/Hubs/WhiteboardHub.cs
index d183e6d..721e441 100644
--- a/dotnet/AipsRT/Hubs/WhiteboardHub.cs
+++ b/dotnet/AipsRT/Hubs/WhiteboardHub.cs
@@ -129,8 +129,7 @@ public class WhiteboardHub : Hub
         await Clients.User(targetUserId.ToString()).SendAsync("Accepted");
         await Clients.User(targetUserId.ToString()).SendAsync("InitWhiteboard", whiteboard);
 
-        await Clients.GroupExcept(whiteboard.WhiteboardId.ToString(),
-            Context.ConnectionId).SendAsync("Joined", user);
+        await Clients.Group(whiteboard.WhiteboardId.ToString()).SendAsync("Joined", user);
     }
     
     public async Task RejectUser(Guid targetUserId)