Why might an ArcGIS user be unable to add data from an enterprise database to an ArcMap document?

The inability to add data from an enterprise database to an ArcMap document can often stem from issues related to user permissions. If the user does not have the appropriate permissions set in the database, they will be restricted from accessing the data necessary for their work. Database permissions dictate who can view or manipulate data, so even if the data exists and is properly connected, lacking the necessary rights will prevent the user from successfully performing operations such as adding the data to ArcMap.

In this context, other factors might influence the data access process but are not the primary reason. A missing folder connection could hinder data access but is less likely to be the root cause when opening data directly from a database. Schema locks can affect operations, but they generally prevent editing rather than viewing or adding data, and issues related to ownership in a public version could imply broader data accessibility rather than hindrance based on user permissions. Thus, ensuring that a user has the right access permissions is essential for successful integration of data from an enterprise database into their ArcMap document.