Orbi AX6000 with ATT Uverse Modem set to IP Passthrough?

Success!  Well, partial success.  Circle Disney not working.  But That's a different forum, right?

Here are the settings and it actually really went smoothly:

1) removed my old routers and extenders (old Airport Extremes)

2) plugged my iMac directly into the Arris NVG599 Uverse Modem via ethernet, connected via browser using 192.168.1.254

3) Went to Firewall/Packet Filter, disabled Packet Filter

4) Went to Firewall/IP Passthrough, enabled IP Passthrough, selected "DHCPS Fixed" and then manualle entered the Orbi Router's MAC Address. Set the Passthrough lease for one day, 10 minutes. 

5) Plugged my iMac directly into the Orbi via ethernet, restarted the Arris Uverse Modem

6) Connected the Orbi's WAN port to the Arris WAN port, plugged in the Orbi

7) Tried logging into the Arris once it restarted to see if I could see it through the Orbi.  YES!  

8) Logged into the Orbi using the web interface Orbilogin.com, registered prodict, followed automatic setup.  It managed to get an internet connection right away!  Sweet!

9) Placed my Orbi Satellite, plugged it in, and it managed to synch with the router with a solid blue light.  Super sweet!

10) Went around to every device (about 30) and either turned off/turned on wifi or forgot network/relogged back in to clear out any crap (whatever that might have been.

Now, when I log onto the Orbi, I can see all my devices and everything seems to be working great!  I already see ain improvement in page loading streaming speeds.  Great stuff!

As I mentioned at the top, I still have to figure out how to get CIrcle Disney back online, and my Sonos system took a hit that took about an hour to reset.  Turns out I had to reset every speaker AND re-pair my surround and base speakers to the Sonos Playbase.  But that's all behind me and so I think I'm in the home stretch.  

THANK YOU for helping Furry and everyone else!