The ArcGIS Dashboard’s pie chart returns the error “Cannot access data” when configured using 'New data expression' for the date field and filtered through the date selector.
This issue is non-reproducible. The DateDiff() function returns a numerical value. Ensure that date values are returned to filter correctly by the date selector. For additional information on DateDiff(), please refer to the Arcade documentation: https://developers.arcgis.com/arcade/function-reference/date-functions/#datediff