Even though your Sophos Update Managers (SUMs) are all unconfigured, the dashboard is showing that everything is up-to-date.
Known to apply to the following Sophos product(s) and version(s)
Enterprise Console 4.5.0
Enterprise Console 4.0.0
What To Do
This happens when you have not fully set up your update managers because there is no data to report on. Once you have at least one update manager downloading updates, the dashboard will display the real status of the configured SUMs.