No valid A or AAAA records could be ultimately resolved for mandonriougenealogie.fr. This means that Let's Encrypt would not be able to 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 mandonriougenealogie.fr is: fr