Device Offline, and cannot port forward

I've tried every other avenue and after getting hung up on after over an hour on-call, I suppose I'll try here.

I've purchased a new device that's supposed to act as a webserver. When I try to port forward, I cannot select the device because it appears offline. I've disabled IPv6, I've given it a static IPv4 address, and I still cannot get it to appear online. I've tried going directly to the gateway to adjust the settings there and it just points me back to the app.

Are there any other options to bypass this? Or do I need to buy a router that will actually let me do what I want it