Not sure if this willl solve your problem, but below is linkedin discussion on what I think is the same question, with solution.
Hope this helps.
Once the Custom Report is published, follow the steps below:
Go to: Company Workspace --> Admin Mode --> Configuration --> User Mode Navigator
Select Project/Shell on the right-hand side and double click which will open the Modify Project/Shell Navigator window.
Look for the Published Report under the Available Modules and Business Processes section (Right Side).
Select the report and move it using the Left arrow in the middle to Reports tab (or any other sub folder under Reports where you want the report to reside) on the Project / Shell Navigator (Left Side) and select OK.
Select the Project/Shell under User Mode Navigator again and select "Deploy" button on top. This will save the changes made.
Now you can give permissions to the report (ignore this step if permission is already given) and navigate back to the report via User Mode and you should be able to see the Report.
Let me know if this works.