Markers defined by url not showing on map

I need to insert markers defined by an url (dynamic markers), but unfortunately it is not shown on the map.
Image markers are fine. I have tried to start from a brand new joomla 3.7.3 installation to be sure I have no conflict with other plugins or modules, but same issue. I have tried with the url link supplied with the vMap demo package, same issue.
Quite despair !...

Hello,
Replied to your Email a two days back, Didn't hear anything back. Can you please check and revert back?

Thanks for solving the issue. Works fine now.