Orbi RBK40 Internet Disconnection Issue

The Help Line was correct that in general it is recommended to have only one router in a home network, either the ISP modem can be the router, or the Orbi can be the router.  An Orbi will still function when set up as a router connected to another router.  (Mine did for nearly two years).  But, there are a host of specific situations which fail dismally with two routers.  (VPN, for one)

Do you have administrative access to the Alcatel?  i.e. Can you look at settings, define the IP address to be given to individual devices, etc.?

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Jetfree wrote:
Sorry, I'm not able to check because my router cannot connect to internet anymore after the netgear helpdesk remotely changed my settings from router mode to access point mode.

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If by "router" you mean the Orbi router, rather than your modem/router, you can access that even when it is in AP mode.

You just have to track down its IP address. There are various ways of finding that, depending on how you are connected, and what with. Something like the desktop genie can find it. You could even use a mobile app.

Find the IP address and then connect to it with a browser.

As CrimpOn suggests, I find it helps to give the Orbit AP a fixed IP address, then I always know how to get at it with a browser.

Then again "cannot connect to Internet" is puzzling. Do you really mean that or do you mean that you cannot get at the Orbi's management graphical user interface (GUI)? That isn't the Internet as most of us understand it. It is a local thing on your network.