You are now able to see Alerts in the View Customer form of the Sage 200 Web Portal.
You can find out more details about the Web portal here:
Sage 200 Standard: https://desktophelp.sage.co.uk/sage200/standard-web/Content/Home.htm
Sage 200 professional: https://desktophelp.sage.co.uk/sage200/professional-web-2023R1/Content/Home.htm