Dan,

Seems like that's not yet supported.

Here's the reply I got from our sharing team:

"Publishing a web scene layer with a SD is not currently supported.

The service url can be added as an item to another portal."

FYI, Pro will still _work_ on a VM through WARP emulation of the GPU, but you'll get very poor performance in 3D if you have no GPU on the VM.

Are the two systems completely isolated?  There's no way to even connect to the production portal from a copy of Pro running on a machine outside the production system?