We have 2 ArcGIS Servers federated with our Portal, I can see them both in our Portal settings here:

When I log on to our Portal (as an administrator) to share layers to the federated server, I can not see them under Server and Folder, I only have the option to share to the Hosting Server:

Does anyone have suggestions about why I don't have the option to share to our federated servers, and what might resolve it? Both the server and the portal are Enterprise 10.7.