When page is hosted on my sharepoint, I get 429 Too many requests

I have a leaflet map on a html page I use to show certain geopositioned assets from my database.

One of the features uses nominatim reverse query for certain user actions. The actions that end in nominatim query are less than one per second, even less than one per minute.

It works perfectly when run on my localhost, and when run from a test server. But when I put my page on my sharepoint server all the nominatim queries end with a 429 Too Many Requests response.

The requests come from jQuery code executed on the browser, either firefox or chrome.

For simplifying and making the point, let's say that the code is run in a click handler of the map

  map.on('click', e=> {
    let popup = L.popup();
    popup
      .setLatLng(e.latlng)
      .setContent(`[${e.latlng.lat.toFixed(5)},${e.latlng.lng.toFixed(5)}]`)
      .openOn(map);
    reverseGeocode(e.latlng, res => {
      popup.setContent(`[${e.latlng.lat.toFixed(5)},${e.latlng.lng.toFixed(5)}]<br>${res.display_name}`);
     });
});

and the reverse geocoding function just invokes the url with a jsonp wrap

function reverseGeocode(latlng,callback) {
    let url=`https://nominatim.openstreetmap.org/reverse?format=jsonv2&lat=${latlng.lat}&lon=${latlng.lng}`;
    $.ajax({ url, 
      dataType:"jsonp",
      jsonp: "json_callback",
      success: callback
    });
  }
};

This code is in the page, and the page is in a private document library in my private sharepoint site hosted by microsoft office365 and accessed as xxxxxx.sharepoint.com

What can I do to solve this limitation?