Visiting Nginx Proxy with Let's Encrypt certificate not secure

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1

I want to use Nginx Proxy Manager to set up some reverse proxies and give then vakud SSL certificates. I made a Let's Encrypt cert with domain "oopsi3online.duckdns.org" and wildcard "*.oopsi3online.duckdns.org". I used DuckDNS as DNS challenge. I wanted to test this so I set up a proxy host for Nginx Proxy Manager with following settings:
Domain: nginx.lan
Scheme: http
IP: 192.168.1.3
Port: 81
I added the SSL cert I created and I enabled force SSL and HTTP/2 Support.
When I visit this page however, I still get a warning saying it's not secure as if it has no valid SSL cerificate. I tried another browser - former being firefox, now google chrome - but this also says it's not secure.

My domain is: oopsi3online.duckdns.org

My web server is (include version): Nginx Proxy Manager v2.12.6

The operating system my web server runs on is (include version): Ubuntu 24.04.3 LTS

My hosting provider, if applicable, is: DuckDNS

The version of my client is: certbot 4.1.1

2

If you want to use a certificate for oopsi3online.duckdns.org on your server, then you need to use https://oopsi3online.duckdns.org/ to connect to your server; This is possible if you add an A record with the address 192.168.1.3. Just as I can't pretend to be google.com, unless you use a private CA, you can't get a certificate for nginx.lan.

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