Add HA A/P FortiGate to FortiManager

Hi,

I do have HA Active Passive FortiGate - Active and Running. Recently, I added a new FortiManager. Kindly guide how I can add FortiGate as an HA to FortiManager.

There is an option on FortiManager to add an HA Cluster. But that means that this is for a new deployment, and now I'm in production.

I followed the normal way to add a node from FortiManager - Add Primary IP - Then I noted that the Secondary became out of sync.

Kindly guide me to the correct way.