Routerlogin.net certificate “not trusted” IoT devices (tv and others) cannot use WIFI

This has been going on for months and have not found answers!!!  I have Orbi RBR50v2 and as devices are using the wifi there are times in the background it tries to connect routerlogin.net.  It won't connect because it is a self-signed certificate so it can't be trusted.  You do not have workarounds as you would with a browser by FORCE adding the certifcate to the your system.   Even on pc, devices that I could force the add certificate it only worked one day but still being rejected by security measures.

How to prevent the Orbi's from using their own dns via the Routerlogin.net (and there are others) or how can we get Netgear to go back to 3rd party signed certificate?