Compatible Modem for Orbi Router RBR20

What Firmware version is currently loaded?
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?

Most DSL or cable modems are compatible with Orbi. 

Some modems have built in routers, if so, This would be a double NAT (two router) condition which isn't recommended. Single function modem is recommended for use with Orbi systems.

https://kb.netgear.com/30186/What-is-Double-NAT
https://kb.netgear.com/30187/How-to-fix-issues-with-Double-NAT

https://community.netgear.com/t5/Cable-Modems-Routers/What-s-the-Difference-Between-a-Cable-Modem-and-Cable-Modem/m-p/1864698#M21950
Couple of options,
1. Configure the modem for transparent bridge or modem only mode. Then use the Orbi router in router mode. You'll need to contact the ISP for help and information in regards to the modem being bridged correctly.
2. If you can't bridge the modem, disable ALL wifi radios on the modem, configure the modems DMZ/ExposedHost or IP Pass-Through for the IP address the Orbi router gets from the modem. Then you can use the Orbi router in Router mode.
3. Or disable all wifi radios on the modem and connect the Orbi router to the modem, configure AP mode on the Orbi router. https://kb.netgear.com/31218/How-do-I-configure-my-Orbi-router-to-act-as-an-access-point and https://www.youtube.com/watch?v=H7LOcJ8GdDo&app=desktop
https://kb.netgear.com/26765/Disabled-Features-on-the-Router-when-set-to-AP-Mode

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Becky2020 wrote:

I have been told that the issues I am having are due to the fact that I do not have a compatible modem to my Orbi Router RBR20.  Does anyone have a list of compatible modems?  I cannot find one anywhere.

Thank you!

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Yiu were told wrong. The Orbi RBR20 is no different than other router.

What model do you have? And what Internet Service Provider do you have?