IP addresses not being assigned in smart home with many IoT devices

The Verizon Fios router details:

Model: Fios-G1100

​https://www.amazon.com/dp/B07QM33Y51

Verizon Fios G1100 | Updated 2019 Version | AC1750 WiFi G-1100 Quantum Gateway Router for Verizon Fios Internet Plans

There is a router included in the modem, and it is running.

I just followed these instructions: and it worked!

https://kb.netgear.com/31100/How-do-I-set-up-my-Orbi-system-to-work-with-Fios

Fios is a bundled Internet access, telephone, and television service that operates over a fiber-optic communications network. For your Orbi WiFi System to work with Fios, you must set up your Orbi router as an access point (AP), following these high-level steps:

1. Turn off your Verizon Fios wireless network.
2. Set up your Orbi router in AP mode. 

If you have purchased your Orbi System directly from Verizon, see How do I set up the Orbi system that I purchased directly from Verizon to work with Fios?

These steps are explained in detail in the following sections.

To turn off your Verizon Fios wireless network:

1. Launch a web browser from a computer or mobile device that is connected to your Verizon Fios router.
2. Enter 192.168.1.1.
   A login window displays.
3. Enter your user name and password.
   The Main page displays.
   Note: If you haven't logged in to your Fios router before, you are prompted to create a new user name and password.
4. On the Main page, click Wireless Settings > Basic Security Settings.
5. Under Turn Wireless ON, select Off.
6. At the bottom of the page, click Apply.

To set up your Orbi router in AP mode:

1. Use an Ethernet cable to connect the Internet port of your Orbi router to the LAN port on your Verizon Fios router.
2. Launch a web browser from a computer or mobile device that is connected to your Orbi network.
3. Enter orbilogin.com.
4. Enter the Orbi router user name and password.
   The user name is admin. The default password is password. The user name and password are case-sensitive.
   The BASIC Home page displays.
5. Select ADVANCED > Advanced Setup > Router/AP Mode.
   The Router/AP Mode page displays.
6. Select the AP Mode check box.
7. Select the radio button for the IP address setting that you want to use:
   • Get dynamically from existing router. Your Verizon Fios router that is on the network assigns an IP address to your Orbi router while your Orbi router is in AP mode.
   • Enable fixed IP settings on this device (not recommended). Use this setting if you want to manually assign a specific IP address to your Orbi router while it is in AP mode.
     
     Note: To avoid interference with other routers or gateways in your network, we recommend that you use different WiFi settings on each router. We recommend that you turn off the WiFi radio on your Verizon Fios router and use your Orbi router only for WiFi client access.
8. Click the Apply button.
   The IP address of your Orbi router changes, and you are disconnected.
9. To reconnect, close and restart your browser and enter orbilogin.com.