Making some progress. I dug a little deeper and found this thread, which pointed me to these instructions for restoring the _lat and _lon metadata fields to a compact template.
So now my events are showing up in Notehub with ‘best location’ data, which is great! However the location data on the Device:Summary page and the Device:Map page is still missing. Perhaps I don’t understand how those are populated. I assumed they would display the location data from the device’s most recent event. Or is that not how those device location fields work?
Thanks!