The basemap gallery in ArcGIS Maps for Office does not include vector basemaps after enabling the 'Use Esri vector basemaps in supported ArcGIS apps' option in the ArcGIS Online Organization account setting.
Closed as non-reproducible in ArcGIS Maps for Office version 4.1.
解决办法
1. Create a group in ArcGIS Online and share vector basemaps with the group.2. Set that group as the basemap gallery group under the Map tab within ArcGIS Online Organization account setting.