I finally uninstalled Avast Business, restarted, then found that Avast (free) was still installed - the Avast Business install did not remove it even though it completed normally.
I was able to uninstall Avast (free), restarted.
Downloaded the Avast Business installer for the third time in case it was defective.
Ran the Avast Business installer, restarted.
Now it shows up properly in the device list. It only took 3 hours to figure it out.