It would be helpful if you could describe the exact sequence of steps you used to register the gateway. Did you use the default protocol or the legacy packet forwarder one? Did you run into any screens where you were asked for or presented with information that didn’t seem to make sense, and simply guessed?
Additionally, do you have any nodes on the same bandplan which are transmitting within range of the gateway? Do you have any access on the gateway itself to tell if it is in contact with a network server and if it is receiving and forwarding packets? For example, is there a local web status page, or can you get a shell via a serial terminal or SSH and use that to view packet fowarder output in /var/log/syslog or some other similar place?