Select anything in sheet and check export. Once sheet selected then data will enable.
you selected one chart to export the data or you are trying to export the data from entire workbook?
Another point is, the user have permission on the data source?
Im the user and i have permission on data source.
From where can i screenshot and show that to you?
Where is the export button available?
Download option is available but within download the 'data' option is not.
That's what the client wants and not the tableau workbook