just an update, I have managed to make it work by completely creating another resource group and then the function, there seems to be an issue with the resource group as it was made years ago. One other thing that I want to mention is that the client must match the type if you are using strong typed hubs, return Clients.All.newMessage(new NewMessage(invocationContext, message)); on the client side would look like connection.On<NewMessage>("Broadcast", (value) => Console.WriteLine(Serialize(value)));