SBCGlobal Email Not Working error arises due to internet disconnectivity or issues in the internet connection. It can also occur due to o various reasons such as error 404! Page not found. To resolve the particular problem you can try and implement the given solutions
Make sure that the device is connected properly to the internet
Clear the browser’s history, Cookies, and cache all the relevant data.
Update the web browser’s settings and make it ready to use.