ATX-1800 Slate - cannot complete setup but I'm connected

Took the router out of the box and followed the setup instructions. I am connected to the router now (wifi) to create this post, but the setup says it cannot detect an ethernet cable in the WAN port even though there is one in there (connected to my switch).
I have reset / rebooted router, but no change.
Thanks.

What does http://192.168.8.1/cgi-bin/luci/admin/network/switch show?
(takes 10 seconds to show actual ports)

Please refer to this link to confirm if it’s a hardware issue.

Could you please provide the model of the Ustream device when the issue happens?
Also, please export a log with a cable connected and PM to me.