The Microsoft Secure Store Service application Secure Store Service failed to retrieve credentials. The error returned was 'Access is denied.'

Ich hatte beim Zugriff über den Dashboard Designer immer dieses Problem, wenn ich per unattended user die Datenbank oder Analysis Service öffnen wollte. Nach verschiedenen Versuchen, von Neuerstellen der Application Services (PerformancePoint Service, Secure Store Service) bis mehrfachen setzen der User hat diese Lösung geholfen:
Central Administration -> Manage service applications -> Secure Store Service -> anklicken der Applikation und "Bearbeiten" im Ribbon wählen. -> Auf der dritten Seite befindet sich eine Text-area mit dem Begriff "Members". Dort sollte der User/Gruppe angelegt sein.

I always had the problem, when I wanted to access the database or analysis-service through the dashboard-designer. After different approaches, like re-creation of the application-services (PerformancePoint Service, Secure Store Service), setting the user several times, this solution helped me to make ist work:
Central Administration -> Manage service applications -> Secure Store Service -> click the application-checkbox and choose "edit" in the ribbon. -> On the third page, there is a text-area with the topic "Members". There your user/group is supposed to appear.

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