Hi @RVG296 , are you trying to download data from a hosted feature layer or another layer item? The latest documentation outlines that CSV exports from dashboards can only occur with hosted feature layers with appropriate sharing and export allowances set. See link below.
https://doc.arcgis.com/en/dashboards/create-and-share/download-data.htm
Hope this helps narrow down your search for a solution, great question!
Jansen Lyons - Records and GIS Section - Public Works - City of Rio Rancho, NM