An alternate way to do what you’re after would be to setup a Virtual Server, such as example.com, and then go into Server Configuration -> Website Options, and set “Website matches all sub-domains”.
That will cause it to act as a wildcard sub-domain, doing all the *.example.com configuration that you require.
I have already gone and done the change to the config
and I see that the Server Configuration -> Website Options
must be reading the info because it was set to YES