Some of the older Beams (the first couple hundred out) used a firmware that required the router to use either channel 1 or 11.
You might try changing the router channel to one of those, and then trying the setup. If that works, update the Beam’s firmware and then you can switch the router channel back.
Also, be sure not to let your phone auto-fill the SSID or password, and don’t use paste either.
Both of those add in a space at the end, which makes it incorrect.