Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
STEP TO REPRODCUE:
Click on the application tab to see your reports

Create a new Dossier and add new Dataset

Navigate to the same path to see that no reports are available although when clicking on Add New Dataset we can see a pop up Select a dataset from any one of your connected environments. Includes existing reports and cubes”

RESOLUTION
The issue has been fixed in the 10.11 version. We can add both Reports and Datasets from "Add Existing Dataset" option.
KB440654