Based on the error message: Let's Encrypt has policies in place to avoid issuing automatically (and thus, at all, since they don't do manual issuance of end entity certificates) for "high value" subjects. This policy has decided that your names are "high value". If you are aware you work for a high value organisation (e.g. a bank, or a famous Internet brand) then unfortunately you may not be able to use Let's Encrypt.
On the other hand it might just be a coincidence, like maybe the names you asked for are too similar to the name of a big Chinese news site or a Spanish bank or something (these are random examples I have no idea) and if it's just a coincidence the Let's Encrypt team will often be able to exempt your names, this process is not instant, but if you can afford to wait a week or three you'll be fine. Here is an example where a name was similar to that of a German bank: