My domain name is: freetodance.it
I have a website hosted on Heroku
My domain provider is register.it
ISSUE: I cannot generate the SSL certificate for freetodance.it (non-www)
If I try to generate it from the Heroku control panel I get that there is an error on the DNS configuration. They use Let's Encrypt.
The Heroku support told me that the ALIAS record is correctly configured, but they notice this error:
noticed this error 404 urn:ietf:params:acme:error:malformed: No order for ID 283617924727
This specific error is probably due to a bug in the ACME client used by Heroku. The client is trying to retrieve or use a specific order, but that order is not known to the ACME server.
I think this is not directly related to your own setup.
If it just happened once, it may be an instance of "the 404 bug", a known issue where sometimes Let's Encrypt's servers aren't as in-sync as they're supposed to be. But trying again would generally work.
As @Osiris says, if this is a persistent error, then it sounds like some sort of bug in their ACME client.