To troubleshoot, from the ZD's Administer/Diagnostics page, enable debug components RADIUS, 802.1x, Dynamic VLAN, and enter your test client MAC address in the box.
Power on the client/radio to capture all connection messages, and proceed to login with uid/pw to AD. Note the client observations, initial IP, subsequent IP, and save the ZD debug info file. Use the support page Log Analyser, or request interpretation from Ruckus tech support, to follow your client transactions in the Event logs. Do you see the new VLAN ID in the radius access-accept, and is it applied by ZD?
You can also capture the br0 interface traffic of the AP your test client connects to, and will see the packet exchange and contents between your client and the AAA/AD server.
Compare a Bradford session with the AAA/AD only session output.