And again @baryah the same issue.
Let’s Encrypt uses Multi-Perspective Validation Improves Domain Validation Security - Let's Encrypt.
This means that your webserver needs to be able to be seen from anywhere around the world for the URLs like http://baryah.no-ip.org/.well-known/acme-challenge/sometokentestfilename
Presently that is not the case as Peter has shown.
And shown again here Permanent link to this check report
Please check your firewall rules.
Also please see