I have gone through all the troubleshooting I can on this.  Once set up, I scan the site to see my network, the DAP1522 sees it.  I click connect, but it doesn't even though the password and settings are correct.  I am using WPA2 encryption.  Why  doesn't this work as advertised?
I, too, am using the 1522 with an AEBS, but without any problems.    The AEBS is a MB053LL/A (A1143), which is two models ago and has one radio (either 2.4 or 5.x).  The AEBS is running 11n only at 5GHz and WPA2 Personal. 
Note:  I couldn't connect the 1522 until I turned off hiding the AEBS SSID; i.e., broadcast the SSID. Once the 1522 was connected, I re-hid the AEBS SSID.  However, after a power outage, the 1522 couldn't find the AEBS, so I've left the AEBS SSID unhidden.
Here's is my 1522 settings (I didn't show my MAC or SSID):
Wireless Radio :      Enabled
Status :     connected
MAC Address :     ********
Network Name(SSID) :     ******
Channel :     149
Security Type :     WPA-Auto- Personal / Auto
Wi-Fi Protected Setup :    Disabled / Configured
Hope this helps.  Let me know if you need more info.