I have an app that has separate back ends for the mobile app and the web portal; I would like to use the same Facebook app to manage both.
My app address is (with domain names changed)
and the mobile app lives at
https://myapp.azurewebsites.net
When I try to add both of these domains to the "app domains" section in my Facebook app, I get the message
App domains must match the domain of the Facebook Web Games URL (https), Mobile Site URL, Unity Binary URL, Site URL or Secure Page Tab URL. Please correct these domains: myapp.azurewebsites.net"
Notice that "Mobile Site URL" and "Site URL" are listed as separate options, leading me to suspect that it should be possible to add a Mobile Site URL separately from the Site URL, which I've included by adding a website from the "Add Platform" menu. But I can't find any way of adding the Mobile Site URL in the Facebook Developer Console.
Am I missing something?