Why does our open data site that is set to public in Open Data settings give a message that it is private when browsing to the URL?

[Mid-America_Regional_CouncilMA]

This the setting tab within the site manager

...and this is the message as displayed in IE 11 when browsing to the site URL: http://data-marc-gis.opendata.arcgis.com/.

Any thoughts/suggestions on what might cause this?

[Mid-America_Regional_CouncilMA]

Answered my own question: Make site public—ArcGIS Open Data | ArcGIS