Will Orbi RBR20 work with Nighthawk 6-Stream WiFi Router AX4300 Model#RAX45

I have successfully connected the Nighthawk AX6 6-Stream WiFi Router AX4300 Model# RAX45. (Just purchased today 4-30-2020 at Costco.)  Internet connection is established and working.  I also have an Orbi RBR20 (main base w/ 2 satellites) we are trying to connect.  Having trouble establishing the internet connection on the Orbi.  (We were using this Orbi successfully up until a few days ago when we upgraded to a faster Spectrum Modem and this new Router.)

Any suggestions?