In our Studio Manager site, we have added a server in the App. and not in the global settings ( admin access)
The SAP is available in this App, but when we create a new App, this server is not appearing, and when we try to add it, it says that this server was already added in an other App.
Even in Admin access ( Global Access) we have the same behaviour with this situation.
As per the design of the Product; In different App's same SAP connection names can not be used.
For correct functioning change the name of Connection name to something else for example for App1 I add original name for example W6R but for App2 add as W6R1 and then it allows user to add the same server .