Wildcard SSL from Letsencrypt - Ok, but CN still “domain.com” not “*.domain.com”

SYSTEM INFORMATION
OS type and version CentOS Linux 7.5.1804 Webmin version [1.998] Virtualmin version [7.1] I installed a wildcard ssl certificate from Letsencrypt but in the browser when verifying the certificate it shows CN = “domain.com” not “*.domain.com”. What do I need to do, what settings to enter in order to display the correct wildcard certificate? Thanks!