You are sharing a global web scene that includes a basemap that uses an unsupported tiling scheme. The only tiling scheme supported for global scenes is ArcGIS Online/Bing Maps/Google Maps.
- Replace the basemap with a service that uses one of the valid tiling schemes.
- If you have access to the source data, reshare the existing tile service layer 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.