I am asked to manually renew my certificate. In Plesk, I don’t see any way to do this.
I see this error message:
Renewal of the following Let’s Encrypt certificates has failed:
Invalid response from https://acme-v01.api.letsencrypt.org/acme/authz/twgS6i9LAuG4QGcBnlUCQqIqqiXzMcvDpXTKZG3A61Q.
Detail: Invalid response from http://thedesktop.com/.well-known/acme-challenge/eL_TlIZJ-rhXyQk_GecT9vYL6Koo5QK1O8YUieVf8W0
Perhaps because this domain is only being used as an email server address and all http requests are 301-redirected to a second domain for actual web content.