Impossible configure DuckDNS

Hi guys,
I’m having some trouble configuring DuckDNS for my HA installation.
When I try to reach https://mattxxxxx.duckdns.org, browser shows me “impossible to find the server”.
All done with DuckDNS add-on:

{
  "lets_encrypt": {
    "accept_terms": true,
    "certfile": "fullchain.pem",
    "keyfile": "privkey.pem"
  },
  "token": "mytoken",
  "domains": [
    "mattxxxxx.duckdns.org"
  ],
  "seconds": 300
}

Configuration.yaml:

Uncomment this if you are using SSL/TLS, running in Docker container, etc.

http:
   base_url: https://mattxxxxx.duckdns.org:8123
   ssl_certificate: /ssl/fullchain.pem
   keyfile: /ssl/privkey.pem

Router config.

I have both of the *.pem file in /ssl.

When I call http://, the browser return me router’s webpage.
I followed the official guide, and other on many websites, with no luck.
Can you help me?

Thanks a lot!

For a start remove that second port forwarding rule. You do not want unencrypted traffic going in or out.

Secondly, please read point 11 here: How to help us help you - or How to ask a good question

The video guides get out of date quickly, the ‘official’ guides are sometimes a little generic.
If you are using a standard hassos install try : DuckDNS - It's not just me - it's you!

Nothing changed… Still the same even installing NGINX and following that short guide…

http:
  base_url: https://mattxxxxx.duckdns.org
  ssl_certificate: /ssl/fullchain.pem
  ssl_key: /ssl/privkey.pem
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