"Unable to connect to Home Assistant" - Nginx Proxy

I am currently trying to set up remote access to Home Assistant. I followed a tutorial available here. When I go to my domain name, and I’m connected to my home Wi-Fi, everything works as expected, which is logical. However, as soon as I switch to 4G, I encounter the error “Unable to connect to Home Assistant”. I would greatly appreciate any help you could provide. Thank you.

configuration.yaml :

# Remote access
    use_x_forwarded_for: true

Nginx configuration :


So, switch to 4G, try to connect, and post the error log here.

I don’t have error, in my home-assistant.log or home-assistant.log.1.