FASTPANEL - Certificate 'domain.com' can not be issued as URL

Ошибка при выпуске SSL Let's Encrypt сертификата в панели FastPanel:

Certificate 'domain.com' can not be issued as
URL 'http://www.domain.com/.well-known/acme-challenge/BiE1L7xGTB5RO6uxD05O' is not available for verification. 
Received response is , expected response was 'BiE1L7xGTB5RO6uxD05O'

Ошибка, из-за того что поддомен-алиас www - не был направлен в Cloudflare по "A" записи на IP VPS.