Hi Elodie,
I would sugegst to try the following steps.
Note: Follow the steps below for only one enterprise user at first.
- Delete the SAP alias of a single problematic user.
- Go to SAP Roles tab and update it.
- Check the same user's properties whether the update of SAP plugin has added an SAP alias to that user or not.
- If added then test the report and connection with SSO.
If you still face the same issue then go with what Rauni has suggested.
~Swapnil