Symptoms

A SharePoint site collection - Site Collection Name] (SharePoint URL) - is already registered with this title. Duplicate SharePoint group providers are not allowed. Either remove the current SP group provider if it is no longer needed or change the title of this site collection.

 

Diagnoses

A SharePoint site collection with the same name has already been registered.
 

Resolution

This is currently by design. A feature enhancement has been logged. The current workaround would be to rename the site collection title.