How do I setup dynamic VLAN assignment on an autonomous Cisco 1142n?

I've gotten my Cisco 1142n autonomous AP configured with every option under the sun, but I still can't get dynamic VLAN assignment working!

I verified the following:

• I give priority to VLAN assignment via RADIUS with aaa authorization network default group radius
• The encryption across all VLANs which might be assigned is the same
• Using debug radius auth I can tell that the AP is receiving the appropriate RADIUS attributes
• I've ensured that the necessary broadcast messages are being sent (on capability and membership changes)

Long story short, I'm pulling my hair out like you CANNOT believe. What am I missing?

Here's my running config: http://dpaste.com/hold/621393/

Thank you SO much in advance for any help you can provide!