Portal Error: Cannot find KML file

[RYANCARL]

Just need a little help to understand why this is happening and if there is a solution someone has found to resolve this issue.

Currently I am running the ArcGIS Enterprise 10.8.1 software and want to build a Web Map that will then be rendered using the ArcGIS JS API. When I load a KML file into the ArcGIS Portal it loads without an issue allowing me to open that data inside a the Map Viewer.

The error that I am getting is "File not found. Wrong url or out of memory." and the error occurs when I save that data to a Web Map and attempt to load that web map with the ArcGIS JS API.  Using the following code:

      esriConfig.portalUrl = "https://xxxxxx/portal";
      const portal = new Portal();
      const webmap = new WebMap({
        portalItem: {
          id: "xxxxxxxxxxxxxxxxxxxxxxxx"
        }
      });      

       const view = new MapView({
        container: mapDiv.current,
        map: webmap
      });

 Attached is an image of the error.

Any help will be greatly appreciated.