ASUS TUF AX4200 Access Point Question

Hello, I've been trying to find information about this.
And I tried https://openwrt.org/docs/guide-user/network/wifi/dumbap multiple times, but I couldn't get it to work.

#1. My ISP modem (which has a router function) is located in the Master Bedroom.
#2. I bought Asus TUF AX4200 for the other bedroom to get Wi-Fi from the ISP modem from #1, but I want to connect my PCs by Ethernet from AX4200.
#3. When I finished all the tasks listed in https://openwrt.org/docs/guide-user/network/wifi/dumbap, I went ahead to the wireless page and scanned/connected one of AX modules to match SSID and Password from my ISP modem.
Afterward, the taskbar showed the network was connected, but I didn't get any internet traffic.

Connecting through a long LAN cable is not an option, I had no problem doing this setup with my older router ASUS RT-N65U (LAN ports no longer work sadly).
Please enlighten me on what I'm doing wrong here, thanks in advance.

A dumb AP requires a wired connection from the AP to the main router. If you must use a wireless connection with a non-OpenWrt device as the main router, the Routed Client is typically used.

Thanks for the quick reply.
Is this thing doable with LUCI GUI?
I'm not familiar with all the command lines yet.

Factory reset Openwrt to return the device to default 'router' mode and settings.

If the LAN IP address of your ISP connected router is 192.168.1.x, then change the LAN IP of the openwrt router from 192.168.1.1 to for example 192.168.2.1. The LAN and WAN ports of the Openwrt router must not be on same subnet.

Then go to wireless settings page and select a radio and scan and connect to your ISP wireless router.

An alternative is relayd if you want all your devices on the same subnet as your ISP connected router. This is a wireless bridge/repeater.
https://openwrt.org/docs/guide-user/network/wifi/relay_configuration

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Thanks, I realized I made a basic mistake.
I was setting 192.168.1.1 for my ISP modem+router for the whole time.
But it was a different IP address (10.0.0.1 instead) when I checked with my phone.

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