When you try to create a new Report in the Report Designer, in the Select Data Provider section, you get a "No Data Providers configured" message.
Alternatively, even though you see some Data Providers, not all of the Data Providers you have in the Reporting > Data Providers section are displayed.
Clarity 16.3.3
The out-of-the-box (OOTB) providers, as well as providers in "Draft" status, are not displayed
If you want to reuse an OOTB provider, copy the provider to a new one by right clicking on it, and save it with your preferred name and settings.
You will have to Publish your new Data Provider to be able to use it in the Report Designer (this also applies to a newly created Data Provider that has been copied).