Nginx configuration problem

Hi,
I’ve made a Nginx configuration for use my home assistant outside,
everything be fine but when I go to my duckdns URL, I have this:


My Nginx configuration is


My router configuration

and duckdns

lets_encrypt:
  accept_terms: true
  certfile: fullchain.pem
  keyfile: privkey.pem
token: xxxxxxxxxxxxxxxxxxxxxxxxxxx
domains:
  - helloyou.duckdns.org
aliases: []
seconds: 300

Does someone help me ?