Get results in a Campaign Transaction Detail report that has on data.
Sometimes there is too much data being accessed for the report and one needs to cut down the amount of data that's considered for the report.
If you saved the report with no data, open it again otherwise start to create a new Campaign Transaction Details report
Click on Selection Window
In the selection window uncheck all queues and all campaigns then check only the queues and campaigns you are interested in
Run the report to see if you get data
If you still are unable to get data for the report please contact 8x8 Support.