00248: Vertical transformation are not supported in web scenes
You are sharing a web scene that contains layers in vertical coordinate systems that require a transformation to match the scene's vertical coordinate system.
Solutions
Remove the scene's vertical coordinate system. The vertical coordinate system of the layers will be ignored.
Use the Project tool to change the vertical coordinate system of the layers to match the scene.
Change the vertical coordinate system of the scene to match that of the layers.
More information
When sharing a web scene, all vertical coordinate systems must match the scene if the scene has a vertical coordinate system.