LAN port not working

I have a router configured as a Wireguard client. When I connect device via LAN to this router, it shows internet but I cant browse. However if I connect to this router via Wifi, I am able to browse.
I have this issue in mango and Opal router with their latest firmware, I have chage the ethernet cables but nothing.
Any idea what the issue would be?

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Please try a few basic troubleshooting steps described here: How to get support quickly

Especially the ping and nslookup parts while connected to LAN and Wi-Fi.