we have an organizational account for ArcGIS. One of our users wanted to use Esri Maps for Office so we installed the tool for him and configured it to use and ArcGIS Online Account. Since we have an organizational Esri Account I did not think it would require any additional subscriptions or something like that to get it working.
But as the user is trying to sign in from his Office-Exel 2013 Software, to use the Esri Maps for Office feature he gets the response that "Sign in has failed" without any additional information.
What can I do to fix this issue?