Let's Debug

Test result for 2590bw.ddns.net using http-01

No valid A or AAAA records could be ultimately resolved for 2590bw.ddns.net. 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 2590bw.ddns.net is: net
The current status.io status for Let's Encrypt

Submitted Jan 27 22:05:15 2023. Sat in queue for 3ms. Completed in 2s. Hide verbose information.