I have 2 MX922s on my network. I can discover one of them from every computer with no trouble. The other one can not be discovered ether through windows or the canon software. All the computers can ping the printer and I can access the web interface. But it will not discover any more. 

I have tried resetting the printer to default and reconnecting. It connectes with no trouble but still can not be discovered. I also have multiple APs with the same SSID near by. I used the option to make sure I was connecting to the closest one by MAC address.