24088: Unzipped KML size of <value> MB exceeds the map viewer limit
You are sharing a map that contains a KML layer as a web map. The <value> parameter refers to the unzipped size of the KML layer that is larger than the 10 MB limit. Although Map Viewer is unable to display KML layers that are larger than 10 MB, the web map can be opened and displayed successfully in ArcGIS Pro.
Solutions
Re-create the KML layer with fewer features or attributes.
Remove the KML layer from the map before sharing.
Do nothing. The web map will share successfully and can be viewed in ArcGIS Pro without issue. When viewing the web map in Map Viewer, the KML layer will not be added.
Additional information
For more information on what functionality is supported and what limitations exist with KML layers in Map Viewer, see What is KML?.
For more information, see Analyze your GIS resource