Ubuntu – How to add a new cluster controller to MaaS release 1.7


I've a MaaS ver 1.7 upgraded via stable ppa and I'd like to add a new Cluster Controller, both of them are on the same network.
When I tried to run that command on a Cluster Controller:

sudo dpkg-reconfigure maas-cluster-controller

on Region Controller dashboard don't see any new cluster in pending.

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I've also open anther new "Ask" because I've try to follow a solution reported on changelog of Maas but without results.

Has anyone tried to add another Cluster on a Region?

Error with MaaS Region Controller and two single Cluster Controller