I have solved the problem related to the device maps. I found the following error in the Javascript console:
js?key=AIzaSyBnwD_0P9Okp733AH1WA7xUe1IU-E0dd1I&_=1571813483746:59 Google Maps JavaScript API error: ApiNotActivatedMapError
https://developers.google.com/maps/documentation/javascript/error-messages#api-not-activated-map-error
Activating the Maps JavaScript API under APIs in the Google Cloud Platform Console solved the maps problem.
No I have to figure out why ping only devices are not displayed in the WorldMap.
Any ideas ?
Thanks