RBR50 - cannot open the ADMIN site using Chrome or Edge (or certificate warnings)

Actually, the latest firmware is v2.7.5.4. https://kb.netgear.com/000065539/RBR50-RBS50-Firmware-Version-2-7-5-4 which was released Feb 23, 2023.  If you ever get access to the router, it can be manually installed (satellites first).
(Totally your choice.)

Not finding the IP address would happen if the laptop were connected to the Guest WiFi network rater than the primary WiFi network. (Easy to check.)

The warnings and security notifications are an awkward issue as a result of modern web browsers having implemented new protocols to "protect" users:

• Accessing the unencrypted (http) web site prompts the "insecure" warning as it does for every attempt to access any http web site.  Knowing that (a) I am on my own LAN and (b) I am 100% certain that this IP address belongs to my router, I simply direct the web browser to proceed to the web site and it remembers this for future connections.  (If a Google search for "space alien parts" took me to an unencrypted web site, I might think twice about ignoring the warning.)
• Accessing the encrypted (https) web site prompts a warning that the SSL certificate is self signed, which it has to be.  Up until about 3 years ago, Netgear had registered several URLs and got a signed certificate. (routerlogin.com, orbilogin.com, orbilogin.net, and several others).  That SSL certificate was not renewed, possibly because those thousands of web sites are not actually run by Netgear (but by thousands of customers all around the world).  Netgear began shipping a self signed SSL certificate with their routers.  Once again, (a) I am on my LAN, and (b) I know that this IP address is my router.  So I direct the web browser to proceed to the IP address.  (If a Google Search led me to a web site that had a self signed SSL certificate, I would perhaps wonder, "why didn't they get a real certificate?")

In short, no one can stop Chrome and Edge (based on Chrome) from complaining about the Orbi web site.  I use Firefox or Opera.  Eventually they may also activate those user protections.

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thfeldman67 wrote:
I have been trying to connect to the ADMIN site hosted by my Orbi router (https://10.0.0.1)

Why are you trying to contact that address?

By default, the RBR50 will pick 192,168.1.1 as its default IP address for the local network.

The router will use10.0.0.1 if it sees something else already in that address. In most cases this means that when you set up the RBR50 it saw another router between it and the Internet. In that case you are into double "NAT country".

Perhaps that explains the odd behaviour you see.

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thfeldman67 wrote:
 I can reach the site using Firefox from my laptop and using Safari from my iPhone - but I get all kinds of warnings about security and certificates and have to circumvent them.

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It is correct that Netgear routers default to 192.168.1.1 for their LAN interface and change to 10.0.0.1 when their WAN interface is assigned an IP in the 192.168.1.x subnet. (and also generally a result of having more than one router.)  But that is not irrelevant to the discussion.

• Firefox (Windows) and Safari (iPhone) connect to the router web interface at 10.0.0.1 with the usual security warnings, but
• Chrome and Edge (Windows) respond that that 10.0.0.1 cannot be found.

The solution is to use Firefox on Windows and Safari on Apple devices.

The question is what would cause Chrome and Edge (based on Chrome) to display this message and what can be done to those browsers to prevent that from happening.