Today at 16:30:08 the status appeared. The process of obtaining a certificate has begun. And no more changes.
Technical support writes - “CSR generated and sent. There is no response from the certification authority yet. We must expect an answer from them.”
According to logs, the last validation attempt for www.zhk-vyshe.ru happened on July 11th, 2019 and each attempt that day did not succeed. I also do not see any previous certificate issuances from any CA according to https://crt.sh/?q=www.zhk-vyshe.ru. I’m not exactly sure what that technical support person actually did or who they sent a CSR to, but server logs show by omission that it was not to Let’s Encrypt.
What are some of the other domains you were able to successfully issue a Let’s Encrypt certificate for?
I agree with @JuergenAuer that this sounds like an issue with ISPmanager.