Hi, I'm tryng to create letsencrypt certificate for my ubuntu server (NGINX), i have my dynu dns update but when I run certbot command i get this error :

Domain: theworkpc.com
Type: unauthorized
Detail: Invalid response from https://freeddns.dynu.com/

To fix these errors, please make sure that your domain name was
entered correctly and the DNS A/AAAA record(s) for that domain
contain(s) the right IP address.

So, what i'm missing ?