What can I do to get them to work

I am probably not going to be able to offer much specific help, but I doubt that this is related to any particular "Insteon communication issue" as the title might suggest. Also, I suspect that the way forward will depend upon whether you are using the portal for remote access or whether you have set this up for direct access through one of your router external ports.

The first thing that I would do would be to open the settings option>>controllers>>my home and see if UDMobile thinks your ISY is online.