Integrate Codeigniter and Phplist 404 Nginx

Im trying to install codeigniter inside phplist and everything is running well in apache.

But its getting 404 when uploaded to live server which is using nginx.

I knew it must be the mod_rewrite problem, and trying google the config but no luck..

please help to fix the config for nginx where the codeigniter is inside the phplist

thanks in advance

Note : Services is subdirectory name for codeigniter files

here's my config

server {
listen 443 ssl http2;
#listen [::]:443 ssl;
include snippets/self-signed.conf;
include snippets/ssl-params.conf;
server_name _;
root /var/www/domain.domain/lists;
index index.php index.html index.htm;
location ~ [^/]\.php(/|$) {
            try_files $uri =404;
            fastcgi_split_path_info ^(.+\.php)(/.+)$;
            fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
            fastcgi_index index.php;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            include fastcgi_params;
            fastcgi_read_timeout 1200;
            proxy_connect_timeout 1200;
            proxy_send_timeout 1200;
            proxy_read_timeout 1200;
            send_timeout 1200;
}
location ~ /.ht {
    deny all;
}
location ~ /.well-known {
    allow all;
}
location /phpmyadmin {
    index index.php;
}
if (!-e $request_filename) {
    rewrite /wp-admin$ $scheme://$host$uri/ permanent;
    rewrite ^/[_0-9a-zA-Z-]+(/wp-.*) $1 last;
    rewrite ^/[_0-9a-zA-Z-]+(/.*\.php)$ $1 last;
}


// ADDING this conf for codeigniter inside phplist but no luck
    location /services/ {
        alias  /var/www/domain.domain/lists/services/;
        try_files $uri $uri/ /services/index.php;
        
        location ~ \.php$ {
            fastcgi_split_path_info ^(.+\.php)(/.+)$;
            fastcgi_index   index.php;
            fastcgi_pass    backend;
            include /etc/nginx/fastcgi_params;
            fastcgi_param   SCRIPT_FILENAME $request_filename;
        }
    }
}

server {
    listen 80;
    #listen [::]:80 ipv6only=on;
    server_name _;
    return 302 https://$server_name$request_uri;
}

and im getting this error

sudo nginx -t
nginx: [emerg] no port in upstream "backend" in /etc/nginx/sites-enabled/your.conf:52
nginx: configuration file /etc/nginx/nginx.conf test failed

HOW TO SOLVE!!

The problem was solved and what triggered the error is fastcgi_pass was set to "backend" where's in my case should set to "fpm-sock" location.

here's my final conf and the codeigniter run well.

server {
listen 443 ssl http2;
#listen [::]:443 ssl;
include snippets/self-signed.conf;
include snippets/ssl-params.conf;
server_name _;
root /var/www/domain.domain/lists;
index index.php index.html index.htm;
location ~ [^/]\.php(/|$) {
            try_files $uri =404;
            fastcgi_split_path_info ^(.+\.php)(/.+)$;
            fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
            fastcgi_index index.php;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            include fastcgi_params;
            fastcgi_read_timeout 1200;
            proxy_connect_timeout 1200;
            proxy_send_timeout 1200;
            proxy_read_timeout 1200;
            send_timeout 1200;
}
location ~ /.ht {
    deny all;
}
location ~ /.well-known {
    allow all;
}
location /phpmyadmin {
    index index.php;
}
if (!-e $request_filename) {
    rewrite /wp-admin$ $scheme://$host$uri/ permanent;
    rewrite ^/[_0-9a-zA-Z-]+(/wp-.*) $1 last;
    rewrite ^/[_0-9a-zA-Z-]+(/.*\.php)$ $1 last;
}
location /services/ {
    alias  /var/www/domain.domain/lists/services/;
    try_files $uri $uri/ /services/index.php;
    
    location ~ \.php$ {
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_index   index.php;
        fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
        include /etc/nginx/fastcgi_params;
        fastcgi_param   SCRIPT_FILENAME $request_filename;
    }
}
}
server {
    listen 80;
    #listen [::]:80 ipv6only=on;
    server_name _;
    return 302 https://$server_name$request_uri;
}