Symptoms
When Publishing a report via K2 Workspace I'm getting error that the permissions granted to user are insufficient for performing this operation --> Microsoft.ReportingServices.Diagonistics.Utilities.AccessDeniedException. Our administrator has given the user account full permissions on the SQL Server reporting service.
Diagnoses
There is actually a missing permission in SSRS.
Resolution
The admin went into the sql server Reporting utility, clicked drop down on Reporting, then selected Security, and gave the user account "Content Manager" rights on the Folder.