Missing primary user values for clients

Problem: Primary User values are empty in vScope for SCCM/MECM clients.
Goal: Confirm the data exists and that the SCCM probe can read it.

Step-by-step checks

Check the table with the vScope credential
```
SELECT TOP 5 * FROM [CM_<site>].[dbo].[v_UsersPrimaryMachines];
```
Expected: rows with Primary User data. If empty or permission denied, continue.
Check with a higher-privilege account
Run the same query with an elevated SQL login.
- If data appears only with the elevated account, the vScope credential lacks rights → grant db_datareader on the site DB (see Grant db_datareader for SCCM site database).
- If still empty, go to step 3.
Verify SCCM configuration (User-Device Affinity)
Ensure user-device affinity is enabled and populated in SCCM so v_UsersPrimaryMachines contains data. Microsoft guide: https://learn.microsoft.com/mem/configmgr/apps/deploy-use/link-users-and-devices-with-user-device-affinity
Target the right site DB
Point the connector to a Primary Site DB (CM_<site>), not just the CAS, since primary sites often hold more complete client data.
Rerun SCCM discovery in vScope
After adjustments, rerun the SCCM discovery and re-check Tables/Properties for Primary User values.