No valid A or AAAA records could be ultimately resolved for codename2221.tk. This means that Let's Encrypt would not be able to connect to your domain to perform HTTP validation, since it would not know where to connect to.
No A or AAAA records found.
The IANA public suffix is the TLD of the Registered Domain
The TLD for codename2221.tk is: tk
The current status.io status for Let's Encrypt