When the app loads, the basemap is white (not visible) until you use the zoom control. After that, the app works except for the BasemapToggle control. I was using another similar post as a template to add a custom basemap to the BasemapToggle control seen here:
There are no errors reporting, so I am not sure what is causing both the fault basemap load and the BasemapToggle issue.
Has anyone else experienced this and have information on resolving the issue?