Hello !
Thank you for posting on Microsoft Learn Q&A.
It is either URL/IDs you entered aren’t in the exact OneLake format or the purview managed identity doesn’t have the right permissions.
You need to use the exact OneLake path format which is Fabric storage type.
Location URL example and the folder can be any you choose Files/… is required for lakehouse files abfss://<WORKSPACE_ID>@onelake.dfs.fabric.microsoft.com/<LAKEHOUSE_ID>/Files/DataQualityAuditExtracts
and paste the GUIDs for the workspace and the lakehouse item into the fields purview asks for and don’t paste names.
https://learn.microsoft.com/en-us/purview/unified-catalog-data-quality-error-records
In Fabric, giveMSI contributor on the workspace that contains the lakehouse.
In the Fabric admin portal enable also users can access data stored in OneLake with apps external to Fabric. Purview writes the error files as an external app and if this is off saving or scanning often fails. https://learn.microsoft.com/en-us/purview/unified-catalog-data-quality-troubleshooting