If you are getting the Data source reference is not valid while trying to create a pivot table in Microsoft Excel, see this post for the fix.

Refresh or change the data source of your pivot table If you have updated the original database with new details, you need to refresh the generated pivot tables.

PivotTable objects are only as good as their underlying data and that can change quickly. If the pivot tables are part of a dashboard, they might not reflect updates at the source level.

In Microsoft Excel, changing the evaluated range on the fly requires a bit of work, but it's definitely possible thanks to the Offset() function.