SSL certificate provisioning fails for familyclinic.com.ru

Hello! Let’s Encrypt certificate provisioning fails for my Netlify project.

Project name: peaceful-lamington-03128e
Primary domain: familyclinic.com.ru
Additional domain: www.familyclinic.com.ru

External DNS provider: REG.RU
A record for @: 75.2.60.5
CNAME for www: peaceful-lamington-03128e.netlify.app

Netlify reports “DNS verification was successful”, but clicking “Provision certificate” results in:
“We could not provision a Let’s Encrypt certificate for your custom domain.”

Let’s Debug HTTP-01 tests passed for both domains.
The browser shows ERR_CERT_COMMON_NAME_INVALID.

Could you check the provisioning logs and help issue and install the certificate for both domains?