Unable to configure RBR50v2

I have had the AC3000 Mesh WiFi System (RBK20) for a few years but about 1 year ago I pulled it out.  I am trying to wipe the router and re-configure it to test a problem I am seeing from the equipment my ISP provided.

I was trying to configure it using the app on my iPhone for the last 6 years and have gotten almost no where.  I have disabled Private Wi-Fi Address and have factory reset the router dozens of times and all I have gotten to is the setup wizard and then i get a configuration error page.

I then tried connecting to it from my laptop and I am able to ping the default gateway, but I cannot get the webpage to load no matter what I try.  I have used Chrome, Safari and Firefox and I get the same results.