BUG
In the Portal for ArcGIS home application, the Item Details > Register option for apps is not available.
Note: This bug was fixed in Portal for ArcGIS version 10.4.
This is a known issue. If the app being registered is hosted on the same web server as the web adaptor that is configured with the portal, the Item Details > Register option is not displayed on the page.
Register the app using the ArcGIS Portal Directory sharing application.
http://webadaptorhost.domain.com/arcgis/home/item.html?id=42ea1b5cdefd4013ac13038927f237d6
https://webadaptorhost.domain.com/arcgis/sharing/rest
https://webadaptorhost.domain.com/arcgis/sharing/oauth2/registerApp
Article ID: 000013283
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