This allows you to update a key on a Synology DSM using the existing API.
Handles restarting the necessary services the certificate is attached to and all other internal stuff (copying the certificate around, etc.)
This is way less error prone than most articles I've found on how to update a Synology DSM certificate.
If a domain was already verified by http-01 method, when we try to issue a cert for them same domain with dns-01 method, we just get only one challenge object of type http-01 with "valid" status, from the authz-v3 url. So, we report error that we are not able the validate the domain, because of that we don't find dns-01 challenge.
This behavior is not the same as before. I believe it was changed by the letsencrypt CA.