There is some issue with non-alphanumerics in SSID, passwords and of course the same old area of hidden SSID to cover.
There are more reasons for this to fail such as the WiFi router is over 20 feet away (the Ambassador uses 25, I'm using 20 for now.)
WPA2 has at least two variations and a third most don't use so AES, TKIP and another so try those two and be sure your router allows this device. Some folk used MAC filtering and that's a dead end.
One last issue. What channel is the router on? Why do I ask? Read
I'm using a WPA2 personal password for a home wireless network, and it works fine for laptops. But a brand new 40-inch Samsung 6300 series TV cannot connect when this password is entered. I'm having difficulty getting a definitive answer regarding whether the Samsung supports this type of WiFi security or not. It would be too bad (and silly) if it does not, but it would be helpful to know in any case.