While trying to set up a new Home Site, I discovered that there is a tool (browser extension) called Page Diagnostics for SharePoint.
After running this, I tried that command again and it was smart enough to detect the problem the tool discovered.
Also Network Trace is available.
Page Diagnostics Tool is defnitely a tool to have in the troubleshooting toolbelt for SharePoint.
Setting up a Home Site
Here is the script: