Hi,
Please ensure you do not tag the native VLAN the management (LAN) IP section; this field should be blank:

this is effectively 'double tagging' and will prevent the AP from receiving a DHCP IP lease in the correct VLAN.
You can tag the SSID with the VLAN chosen for client traffic by navigating to Wireless > Configure > access control, selecting the SSID from the dropdown menu, and scrolling to the bottom of the page:

If the above is configured correctly, and you are seeing the lease assigned from the server logs, try rebooting the AP by cycling the upstream switchport.
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