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There was a limitation until recently about using some aggregations on Tableau Server data sources based on ODBC connections. If you upgrade to the latest maintenance release, this will probably be fixed.
However, even better would be for you to connect using Tableau's native connection rather than a DSN. Tableau's native connection is generally better than a generic ODBC connection.
Thanks Dan. My customer updated desktop and server to 9.2 and it fixed the issue. We are going through certification with a native connector so customers are having to use generic driver for now.