Now the problem for me is that all enclaves in my map is currently allied status and that I'm at maxed community members. The solution is to disband the enclaves via recruiting member (if said enclave are allied) or threaten them (if said enclave relationship is lower than allied). I found this from reddit that when you have more than 11 enclaves in your map (15 enclaves in my case during my playthrough) the final mission for Warlord Legacy refuse to start. Not sure if the info worth much by now, but might just put this as reference.
