We've started evaluating the ArcGIS API for Javascript, and need access to content (layers, maps, etc.) that are set to the Organization sharing level, but so far have only been able to access content belonging to the same user that created an api key, or app credentials. Using an API key, this article (https://developers.arcgis.com/documentation/mapping-apis-and-services/security/tutorials/create-and-manage-an-api-key/#content-and-items) states you can click on the 'Add Items' button from Content and Items, but that button does not exist from my dev dashboard. I've also implemented Application Credentials and obtain a token from our app's client ID/Secret, but am still not able to access content that's specified at the Organization level.