Noticed today that if you've got a database connector, and the account you're connecting with has access to the database but no roles assigned (db_reader etc) then a request schema will not show an error - it will instead show that there are no schema fields.
Test agent completes without issue.
The only way to show the error (no SELECT permission), you have to manually add a schema field and attempt an import.
The schema provider should display this same error when attempting to get the schema.
Customer support service by UserEcho