It is warning and don't cause not displaying map
Can you give direct link to your page with map.
For track with elevation you need to set KML (Internal parser) or GPX (Internal parser).
I can't tell more without map page. Check browser console for errors.
Indeed, there was a bad setting of the key on the Google Map site.
I just corrected that.
However, this key setting error did not prevent the display of paths in KML format with the old version 3.10.11 JOOMLA.
It is since the migration to version 4.3.1 of JOOMLA that there is this display defect, and the anomaly persists despite the patches concerning the Google Map key.