Out of the Box Reports in Advanced Reporting do not display data for Days/Months/Weeks prior to a certain date.
All related jobs, like Time Slice, Load DataWarehouse have been run.
Data that matches all the selected options is present but does not get displayed.
All the reports in Advanced Reporting are based on Time Slices.
Even though the Time Slice job has been run, the date range of the Slice used should cover the Period of the report.
The Capacity vs. Allocation by OBS report uses MONTHLYRESOURCEAVAILCURVE, WEEKLYRESOURCEAVAILCURVE, MONTHLYRESOURCEALLOCCURVE and the WEEKLYRESOURCEALLOCCURVE Slice.
Check the From date and the Number of Periods to ensure that the Period of the report is covered in this Date Range.