Hi @JeffKurzner and @GHarris - see my answer / solution found here. https://community.esri.com/t5/arcgis-platform-developers-ques/sharing-app-and-map-content-with-public/m-p/1346726#M65. Details below. Also, please check out the detailed doc on Data hosting as it applies to Platform and Online - https://developers.arcgis.com/documentation/mapping-apis-and-services/data-hosting/ We recently disabled the ability to share certain hosted data services with the public for Developer accounts only. With the Data hosting feature of ArcGIS Platform coming out of beta on November 1st, usage is now metered on all hosted data services owned by Developer accounts only. In order to share any of your data with the public you must provide authentication to the service in the form of an API key or other authentication method. Please review the documentation at Data hosting as well as the manage sharing and security section.
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