May 17, 2019 01:42 AM|Fei Han - MSFT|LINK
Welcome to ASP.NET forums.
This works for multiple computers I've tried on each machine. But it does not update for other connections/computers.
I checked the code that you provided, but not find something wrong with the code snippet. As you said, it does not work well on a specific computer, please check whether there are any errors in browser F12 developer tools Console tab.
Besides, [SignalR Tracing](https://docs.microsoft.com/en-us/aspnet/signalr/overview/testing-and-debugging/enabling-signalr-tracing) enables
us to view diagnostic information about events in SignalR application, which would help troubleshoot the issue, you can try it.
$.connection.hub.logging = true;