Portal for ArcGIS - Basemap Thumbnails Not Displaying - 498 - invalid token

[KateřinaUhlířová]

Hello,

base map thumbnails don't display if application and web map is shared for a group (even to admin). If it is shared for everyone, it's OK. Thumbnail pictures are in the right folder. Group of basemaps is shared for everyone.

Other users have the same problem (https://community.esri.com/thread/161777 at the end)

Can someone help?

Thanks.

[DawnStalberg]

Hi Esri - please can you assist with this issue.

The only time the thumbnails show in the basemap gallery is during the WAB edit session if you have edited the Basemap widget.

Thanks