Robert is having an issue with UWA apps bought in the Windows Store. He can't connect using them. Microsoft has been dealing with this issue for three years, and he can read more about it at answers.microsoft.com here.
The chatroom offered up this page at social.technet.microsoft.com.
Leo has a hunch it's a settings issue. Robert should try disabling "automatically detect proxy settings". He can also try different DNS servers. Security software could also block it. One thing to try is resetting his PC with Windows recovery.