Query results will show activity of target application usage in Secure Store Service, including which accounts are requesting access to the PowerPivot unattended data refresh account.
Troubleshooting PowerPivot Data Refresh
Ed Price - MSFT edited Revision 8. Comment: Space formatting; added tags
Ed Price - MSFT edited Revision 4. Comment: Updated title with more info. Formatted bold for UI text. Found a typo. Added a period. Added TOC.