All simulated renewals failed. The following certificates could not be renewed: /etc/letsencrypt/live/jeedom.kuchta.fr/fullchain.pem (failure)

[Osiris]

There are a few issues with that community how-to:

• The Certbot PPA has been DEPRECATED;
• Using the acme-dns.io instance is discouraged, as you are effectively authorizing the acme-dns server to act on your behalf in providing the answer to the challenging CA, making the instance able to request (and get issued) a TLS certificate for the domain that has CNAME pointing to it. (Source: GitHub - joohoi/acme-dns: Limited DNS server with RESTful HTTP API to handle ACME DNS challenges easily and securely.) You're encouraged to run your own instance of acme-dns for safety reasons.