Could you shre with me what you did to get the Gateway adopted?

The issue is the Gateway needs an edit on the LAN so it can adopt. You should roll out a quick patch to fix this issue on the Gateways urgently! Not wait for who knows how long for a the V5 version...

Could you post that FAQ sticky over here?

Workaround (and save yourself hours of troubleshooting): Configure using the default standalone method (eg. Laptop/PC/Mac on autodiscover IP connecting it to the LANPort of the Router). Then go to...

@Dillius This is a serious problem. I can't edit the default 192.168.0.1/24 of the controller depite me having OC200 and AP's working on a different subnet 172.16.127.1/24. Not being able to edit the...