When you first set up Desktop Analytics, the reports in Configuration Manager and the Desktop Analytics portal may not show complete data right away. It can take 2-3 days for the service to process the data. If it's been over 72 hours, and the portal is still processing data, follow these steps:
To confirm that active devices are properly configured, use the Connection Health dashboard. This dashboard doesn't update in real time.
Make sure devices are sending diagnostic data to the Desktop Analytics service. For more information, see Enable data sharing.
Provision Azure AD applications on your Azure AD.
If devices are properly configured, and you're still not seeing data in your workspace, contact Microsoft support.