You are sharing a global web scene with a basemap that uses an unsupported tiling scheme. The only tiling schemes supported for global scenes are ArcGIS Online/Bing Maps/Google Maps, WGS 1984 Geographic Coordinate System, Version 2 and CGCS2000 Geographic Coordinate System.
- Replace the basemap with a service that uses one of the valid tiling schemes.
- If you have access to the source data, publish a custom basemap using one of the valid tiling schemes.
The web scene viewer requires all global scenes to use one of the valid tiling schemes listed above. To ensure you will be able to consume your scene in the web scene viewer, include a basemap that uses one of the supported tiling schemes. For more information on tiling scheme requirements, see Basemap and elevation layers.
The CGCS2000 Geographic Coordinate System tiling scheme is not supported when sharing a web scene to ArcGIS Enterprise.