Accessing Denon1912 from wired and wireless devices

I have a Denon 1912 that is connected to my network using power line adapters. It works fine, I can stream music, etc. The airplay works when I use my computer that is on the network through a wired connection. However, it does not work when I use wireless devices (iPhone, Laptop). Also, the iPhone Denon Remote App cannot detect the receiver. Any help will be greatly appreciated.

I cannot see a solution to my problem in your link.