Orbi RBKE 963 CONNECTING TO WIFI CONTROLLED PRODUCTS

So 20ft is too close between the RBR and RBS and in between them. 30 feet or more is recommended in between RBR📡 and RBS🛰️ to begin with depending upon building materials when wirelessly connected.
https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite ‌‌🛰️

You might turn OFF the RBS for now and just work with the RBR. Once you get things going, then turn on a RBS.

On the RBRs web page under the basic tab/wireless settings page, there should be a section towards the middle or bottom of this page that is labeled IoT network. This is were you can configure 2.4Ghz only SSID name-IoT something and give a password. 

https://kb.netgear.com/000064267/How-do-I-enable-or-disable-the-Internet-of-things-IoT-network-on-my-Orbi-WiFi-6E-System

https://kb.netgear.com/000064269/How-do-I-change-the-Internet-of-things-IoT-network-name-SSID-and-password-on-my-Orbi-WiFi-6E-System

https://kb.netgear.com/000064270/How-do-I-change-the-Internet-of-things-IoT-WiFi-band-on-my-Orbi-WiFi-6E-System