The rsreportserver.config has EnableAuthPersistence (with an E) while the documentation has EnableAuthPersistance (with an A).It also appears that if you are using SSRS in SharePoint Integrated mode and SSRS is installed on the same SharePoint server as the WFE and you are using WindowsIntegrated/Kerberos authentication end-to-end, then you need to set this to FALSE as SharePoint appears to reuse it's connection to SSRS, regardless of which user is attempting to run a report in SharePoint.
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