Querying Sharepoint Task List via Spotfire


I am extracting data directly from a Sharepoint TASK list and reading it into Spotfire using its built-in OData connector. I can extract all columns for my task list except there is no column that appears which indicates the 'assigned to' field. Would anybody know how I can extract this column too? As it doesn't appear to be extracted when I retrieve all columns.

Any advice would be most appreciated.