In certain cases when using AC66U NIC'S like your board has, and non AC66U routers, they either won't see the SSID which is rare, or if you can see the SSID the connection may or may not be completely stable. This usually only applies when using the 2.4GHz frequency.
Have you tried setting up the 5GHz SSID on your dual band router?
It's more likely that the AC66U NIC on your board will connect to your router on the 5GHz frequency. The problem with using the 5GHz frequency is that the wider bandwidth won't go through walls worth a damn but works very well if there are no obstacles in the way.