error duplicate listen options for [::]:443 when trying to add a subdomain to my nginx setup

Posted June 8, 2021 3.2k views
NginxLet's EncryptUbuntu 18.04

I followed this DigitalOcean guide on how to setup Nginxon an Ubuntu 18.04 droplet. I set up my domain’s nameservers to point to Cloudflare’s and then based on what I had read previously my understanding that to add a subdomain ( in this case) I could simply add a file titled ( to the /etc/nginx/sites-available (and symlink that file with /etc/nginx/sites-enabled)
Keep in mind I am using Let’s Encrypt

However when I add that file and then try to enable that site, I get the following when running sudo nginx -t

nginx: [emerg] duplicate listen options for [::]:443 in /etc/nginx/sites-enabled/
nginx: configuration file /etc/nginx/nginx.conf test failed

Now the config was created by copying the config and modifying it slightly. With the blog subdomain not included in sites-enabled nginx produced no errors in the configs.
I have tried the same procedure to create the config for the subdomain twice, no luck. I have shown the below files to a buncha people who then suggested I try a couple different things like removing the default config from sites-enabled, no luck.
So can anyone please help with this issue?
Also before I forget I intend to deploy Ghost on that blog subdomain

My nginx.conf, config, default config, and configs are attached in the pastebin links below.

Nginx.conf config
default config config

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Show answer This answer has been marked as resolved by faizanjamilwork.