FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream

nginx.md

From my end need to setup the root /var/www/WordPress/; and
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

$document_root required

server {
    listen 80;
    server_name localid.blog.com;
    root /var/www/WordPress/;

    location / {
        index index.php;
    }

    location ~ \.php$ {
        # fastcgi_param SCRIPT_FILENAME /opt/homebrew/var/www/site/$fastcgi_script_name;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

        include fastcgi_params;
        fastcgi_pass unix:/opt/homebrew/var/run/php-fpm.sock;
    }

    location ~ /\.ht {
        deny all;
    }
}