"Secure Connection Failed" Error when trying to connect to HTTPS

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UPDATE: Ok @JuergenAuer, I think I’ve realized the problem is likely with the Key/Cert Pair. I have updated my Nginx CONF file as follows:

server {
    listen 80; listen [::]:80;
    server_name boards.epochgames.co.uk;

    # Redirect all HTTP requests to HTTPS with a 301 Moved Permanently response.
    return 301 https://$host$request_uri;
}

server {
    # The IP that you forwarded in your router (nginx proxy)
    listen 443 ssl http2; listen [::]:443 ssl http2;

    # Make site accessible from http://localhost/
    server_name boards.epochgames.co.uk;
    root /home/lighttpd/http;

    # SSL config
    # ssl on;
    ssl_certificate /etc/nginx/ssl/0000_csr-certbot.pem;
    ssl_certificate_key /etc/nginx/ssl/0000_key-certbot.pem;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;
    ssl_session_tickets off;
    # include /etc/nginx/snippets/ssl.conf;

# The internal IP of the VM that hosts your Apache config
    set $upstream 192.168.0.104:2045/;

    location / {
        # proxy_pass_header Authorization;
        proxy_pass http://$upstream;
        proxy_set_header Host $host;
        proxy_set_header X-Forward-Proto $scheme; #X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_http_version 1.1;
        # proxy_set_header Connection "";
        # proxy_buffering off;
        # client_max_body_size 0;
        # proxy_read_timeout 36000s;
        proxy_redirect http://$upstream https://boards.epochgames.co.uk/;
    }
}

When I run nginx -t I receive the following:
nginx: [emerg] PEM_read_bio_X509_AUX("/etc/nginx/ssl/0000_csr-certbot.pem") failed (SSL: error:0906D06C:PEM routines:PEM_read_bio:no start line:Expecting: TRUSTED CERTIFICATE) nginx: configuration file /etc/nginx/nginx.conf test failed

I don’t think I’m generating the Key/Cert pair properly. @JuergenAuer would you mind explaining how I would go about generating a proper Let’s Encrypt Key/Cert pair? And would I do it on the Discourse VM or on the Nginx VM?