In the new Google Map, if you click a location on the map, it loads the location below the top-left search bar with the latitude and longitude as well.
Once you click on the GPS coordinates, it loads the exact location of that point. So you can use the generated link. (Example:
You can do the same for your marker unless what you want is a link to the marker on that specific map. I don't think that is available as a feature at the moment.