Can someone please explain to me what I might be doing wrong or if I've missed the point of the OC220 controller entirely.

I have an OC220 at HQ and directly manage an ER605 on the LAN.  I also have two remote sites, one with an ER707 M2 and another with en ER703WP-4G-Outdoor.  All of them are up to date (the ER707 and ER703 are on the initial firmware releases, no upgrades available).  All three sites have IPSec VPN tunnels set up with each other, so any device on any site can access any other site.

My issue here is trying to somehow add/adopt the two remote sites into the OC220.  I've looked up multiple guides looking for some way to do this, but what I've run across is either outdated information or guides that don't seem to apply to my scenario.

If the OC220 is incapable of directly managing these two other infrastructures then I need to know in a no-nonsense fashion.  If there is some alternative to how I can look at all three sites in a single pane of glass then a clear, concise guide would be greatly appreciated.  The OC220 is supposed to be able to manage multiple gateways, is it not possible to set up multiple sites on the controller and assign gateways to them?

One of the biggest headaches in IT is often a lack of proper "prerequisites" and also "gotchas" that come along with a lot of these guides.  Like when I first added an OC220 to my existing ER605, rather than adopting existing configuration it just wiped them out, you would think it would make sense to offer a way to adopt a device and all of its settings into a new site without wiping things completely clean.  Or once again am I missing something?  I don't mind if wiping out and starting over is the only way to do it, at least for one of the sites, but the other would be a pretty sizable pain.

Well after much head scratching, swearing, and research, finally found my answer (mostly) by defining the Inform URL via a Dynamic DNS hostname and setting up port forwarding inbound to the OC220.  As expected some networking stuff broke, but less than I feared by allowing the network to auto detect.

But now the bigger issue is that the gateway no longer broadcasts SSIDs.  Adopting the gateway erased the existing SSIDs and though I've re-added, not even a simple SSID appears to broadcast now even after reboots and multiple attempts to configure via the OC220 Controller.  Very frustrating.