Apex domains cannot have CNAME records.
Question and response
Question
dig e-steiermark.com. NS
Answer
e-steiermark.com. 5 NS ns2-34.azure-dns.net.
e-steiermark.com. 5 NS ns3-34.azure-dns.org.
e-steiermark.com. 5 NS ns4-34.azure-dns.info.
e-steiermark.com. 5 NS ns1-34.azure-dns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0