To extract metadata and to configure other capabilities that a catalog source might include, you need account access and permissions on the source system. The permissions required might vary depending on the capability.
Permissions for metadata extraction
Ensure that you have the required permissions to enable metadata extraction.
Verify that the SSRS administrator created a Report Server user with permission to view and download reports and shared data sources. Depending on the scenario, you need to get the Report Builder Role and the Publisher Role or the System User Role.
Permissions to perform data classification
You can perform data classification with the permissions required on the source system to perform metadata extraction.
Permissions to perform glossary association
You can perform glossary association with the permissions required on the source system to perform metadata extraction.