I’m guessing your Omada devices need to connect to a local controller that’s located on a private LAN (reaching controller through Internet). First, did you set up port forwarding on your firewall to forward the necessary ports to the local IP of the Omada controller? Second, did you configure (inform) the remote devices to use the public IP address of your firewall as the controller’s IP, where the firewall rules and port forwarding are applied)? Without these two steps, remote devices won’t be able to reach your controller properly.