Is there a reason the ArcGIS provider does not require a key? Following the documentation shows the map without any issues.
https://docs.telerik.com/devtools/wpf/controls/radmap/features/providers/arcgis
Also, is there a way to use other styles or basemaps other than what the control provides? In particular, the imagery hybrid, which is aerial imagery with the roads/labels.
Is it possible to change the max zoom? ArcGisWorldMapSourceBase.cs uses a max zoom of only 19. I have the same issue with the Bing and Azure providers. I'd like to use the higher zoom levels available and not have the map control scale the images, which will then be blurry.