Are you sure that the client VLAN is trunked to the controller? The AP messages might have nothing to do with the client issue.
I'm running with same AOS 8.4 and cluster is wokring fine.
can you rechek below another configration points:
1. Cluster profile and Exclude vlans list.
2.And allowed vlans and native vlan id list under interfaces of MC's
3. did you see any output like
>show lc-cluster group-membership if its not connected then there is issue with version/limitation/physcial connectivity issue/IPSec tunnel setup issue.
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