How do you configure a federated server to use an existing ArcGIS Online account?

To configure a federated server to use an existing ArcGIS Online account, utilizing the federation process in the ArcGIS Enterprise portal settings is the appropriate method. During the federation process, the ArcGIS Server establishes a trusted connection with the ArcGIS Online account. This process enables the server to authenticate and communicate effectively with the online resources, allowing users to access and utilize maps, apps, and datasets stored in ArcGIS Online.

The federation process involves configuring settings such as the portal URL and providing authentication credentials for the ArcGIS Online account. Once this connection is established, your federated server can leverage the capabilities of the ArcGIS Online platform, enabling seamless integration between on-premises and cloud resources.

Considering the other options, manually exporting configuration settings would not inherently establish a federated connection since this generally relates to how settings are transferred rather than connecting services. Reinstalling the Server software would not facilitate the connection to an existing ArcGIS Online account and could disrupt current configurations. Creating a new organization in the Enterprise could lead to unnecessary complexity, as it is more efficient to connect to an existing account rather than establishing a whole new organizational setup.