Have you checked current topics:
http://forum.mikrotik.com/t/vlans-creation-and-testing-ax2/173504/1
http://forum.mikrotik.com/t/new-capsman-client-works-on-hap-ac2-but-not-on-wap-ac/173530/1
http://forum.mikrotik.com/t/unable-to-get-vlan-working-between-rb5009-and-ax2/173545/1