I've set up 2 so far with no issues using WPA. Make sure you're holding the button down long enough for the WPS to enable. On my Netgear router, one of the flashing amber lights turns on steady when WPS is enabled. I think you may also have to verify that WPS is available in the router settings. Seems like mine has a checkbox, so yours may be unchecked.Here's pic with the WPS button ID'd.
1/23/13 at 5:13pm