DPA: "Clients with Low Dedup Ratio" Shows "No results found"

The system report "Clients with Low Dedup Ratio" report, when run against Avamar or NetWorker, does not populate any data.
"No results found" is displayed to the screen.

Checking this report's Data Sources, the user can see this is "Deduplication Status" on Data Domain.
The Deduplication Status source which is populated by the "Data Domain analysis" request which is disabled by default.
This is per design and outlined in the Data Protection Advisor Data Collection Reference Guide.

Example:

Confirm that the Data Domain the backup server is backed up to.
GUI: Inventory > Object Library > Storage
Click on the Data Domain > Data Collection

Click on the "DataDomain Analysis" request > History
The cause can be that the request never ran or has not run in a long time.

Ensure a successful data collection run for the Data Domain Analysis request.
Once this has been completed with the status "Success," then test the report.

The user can configure the frequency Period or Schedule, but intervals equal to or greater than one week have to be chosen.