Adding server connections to ArcGIS Online Organization Hosted Feature Service Hive URLs in ArcGIS Pro does not display any services in the resulting connection.
When connecting to the specified server in the current version of ArcGIS Pro (2.3 development version), all the items can be seen in the server connection in ArcGIS Pro with the same connection in ArcMap.
解决办法
Utilize the Portal tab of the Catalog pane to retrieve feature services from an ArcGIS Online organization, provided the desired organization is set as the active portal.