Using Reverse Proxy Nginx in a docker container

So trying to setting Nginx as a reverse proxy using docker - I have three node js containers (one frontend and two backend services) the frontend service calls the two backend services. So I want nginx to redirect to the frontend (which is web application), but everytime I try to send something I get a 502 bad gateway error. When I directly exec into the docker containers I can ping the other containers via dns_hostname or ip address (which I grab from docker inspect) Here is an edited version of both my docker-compose and my nginx.conf

    version: "3.8"
services:
  frontend:
    image: frontend
    hostname: frontend
    env_file:
      /.env
    networks:
      - network
    restart: on-failure
    expose:
      - "3000"
    container_name: frontend
    backend-service-01:
      image: backend-service-01
        hostname: backend-service-01
        env_file:
            ./backend-service-01/.env
        networks:
            - network
        restart: on-failure
        container_name: backend-service-01
   backend-service-02:
        image: backend-service-02
        hostname: backend-service-02
        env_file:
            ./backend-service-02/.env
        networks:
            - network
        restart: on-failure
        container_name: backend-service-02
        
   nginx-proxy:
     image: nginx:stable-alpine
     hostname: nginx-proxy
     networks:
       - network
     restart: on-failure
        volumes:
          - /data/nginx/conf/nginx.conf:/etc/nginx/nginx.conf
          - /data/nginx/certs/crt_file.crt:/etc/nginx/crt_file.crt
          - /data/nginx/certs/priv_key.key:/etc/nginx/priv_key.key:ro
        ports:
            - 80:80
            - 443:443
        container_name: nginx-proxy
        depends_on: 
          - frontend
          - backend-service-01
          - backend-service-02
networks:
    network:

As well here is the nginx conf file I'm using:

worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 1024;
}

http {

  upstream frontend {
    server frontend:3000;
  }
    
  server {
        
        # Listen Directive on Port 443 (TLS)
        listen              443 ssl; 
        listen              [::]:443 ssl;

        ssl_certificate     /etc/nginx/crt_file.crt;
        ssl_certificate_key /etc/nginx/priv_key.key;

        # Where we store our error.log and access.log
        error_log           /var/log/nginx/error.log;
        access_log          /var/log/nginx/access.log;

        location / {
            root /usr/src/app/public/;
            proxy_pass https://frontend;
        }
  }
}

I've almost done everything to rule out a networking issue, as I can ping both the ip address and the frontend docker hostname from the inside of the nginx container (using docker exec -it nginx-proxy sh) is anyone has any suggestions on what to try next or they can see clearly if I'm doing something wrong it would be much appreciated.