Thanks. In the end, being on with Netgear chat support, I was able to get it to work by hitting the reset button on the Orbi and going through all the steps again, and directly accessing the webpage through the 10.0.0.1 address (the other default addresses are used by my modem). Once I was through all that, the app on my phone started to work. So, A+ for the support staff, although it took hours, and like a D- for an app and setup that clearly couldn't work without their helpline's intervention on a device that was pretty pricey. I also found that when it wasn't going anywhere and I had lost confidence in the product, getting a return authorization was going to be a huge hassle (I ordered it direct from Netgear, not Amazon, as I'm trying to give less business to Amazon -- but Amazon honors returns).
