How to setup nginx reverse proxy for sub domain

Hello, I’m trying to setup Nginx so I can have sub domains like

www.MySite.com -> Main website (Works correctly) jenkins.MySite.com -> sub domain for Jenkins gitlab.MySite.com -> sub domain for Gitlab

I’ve tried following various tutorials and I seem to have included everything required to make this work, but still to no avail.

I’ve followed this: https://www.digitalocean.com/community/tutorials/how-to-configure-nginx-with-ssl-as-a-reverse-proxy-for-jenkins and various other sources online.

[Nginx Server Block] I’ve edited my nginx.conf file, I’ve created a new nginx/sites-available conf file for Jenkins and symlinked it to sites-enabled.

This is my default/jenkins JENKINS_ARGS

JENKINS_ARGS="--webroot=/var/cache/jenkins/war --httpListenAddress=127.0.0.1 --httpPort=$HTTP_PORT -ajp13Port=$AJP_PORT"

This is an example of my jenkins server block in nginx

server {
    listen 80;
    return 301 https://$host$request_uri;
}

server {

    listen 443;
    server_name jenkins.MySite.com;

    #ssl_certificate           /etc/nginx/cert.crt;
    #ssl_certificate_key       /etc/nginx/cert.key;

    #ssl on;
    #ssl_session_cache  builtin:1000  shared:SSL:10m;
    #ssl_protocols  TLSv1 TLSv1.1 TLSv1.2;
    #ssl_ciphers HIGH:!aNULL:!eNULL:!EXPORT:!CAMELLIA:!DES:!MD5:!PSK:!RC4;
    #ssl_prefer_server_ciphers on;

    access_log            /var/log/nginx/jenkins/access.log;

    location / {

      proxy_set_header        Host $host;
      proxy_set_header        X-Real-IP $remote_addr;
      proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header        X-Forwarded-Proto $scheme;

      # Fix the “It appears that your reverse proxy set up is broken" error.
      proxy_pass          http://127.0.0.1:8080;
      proxy_read_timeout  90;

      proxy_redirect      http://127.0.0.1:8080 https://jenkins.MySite.com;
    }
  }

I’ve also created an A record in DigitalOcean - Network and also a CNAME

Much help would be appreciated.

Thanks