Pi-hole Https Problem

Hello,

I’m having trouble with Pi-hole + DuckDNS/Let’s Encrypt.
I can reach the Pi-hole with port 80 (http) but when I try reaching it with https I get “404: Not Found”.
Any ideas of what I’m doing wrong here?
I have opened ports 443 -> 8123 on the rpi’s IP which is setup as static through my router and followed every instructions to install it.