Creating new workspaces with external users will fail. It does not create a workspace after creating a new list item. The Status column and the URL field are not gefüllt.Arbeitsbereich will not be created (with external users)
The following error message appears in ULS.Log:
. Solutions2Share.Solutions.Collaboration Manager.EventReceivers <> c__DisplayClass2 <ItemAdded> b__0:. Object reference not set to instance of an object to. Exception Type: 'NullReferenceException' Exception Message: 'Object reference not set to instance of an object to.' Stack trace 'at Solutions2Share.Solutions.CollaborationManager.EventReceivers.WorkspaceListEventReceiver. <> c__DisplayClass2 <ItemAdded> b__0 (). 'Source:' Solutions2Share.Solutions.CollaborationManager 'Target Site: Void <ItemAdded> b__0 ()'
All users who are to create a workspace, must have permission to use the entry "Collaboration Manager" in the Secure Store Service. Especially when they are accessed by outside users multiple authentication providers are mostly used. The use of the keyword "Everyone" is here not sufficient because this keyword, only the internal users, which are maintained in Active Directory into account.
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In this example, the two system groups are "All Users (AspNetSqlMembershipProvider)" and "All Users (Windows)" entitled.
After this adjustment, the creation of workspaces is possible again.