Apex domains cannot have CNAME records.
Question and response
Question
dig scs-ns.org. NS
Answer
scs-ns.org. 5 NS ns2.scs-ns.org.
scs-ns.org. 5 NS ns3.scs-ns.org.
scs-ns.org. 5 NS ns1.scs-ns.org.
Authority
The response has no authority records.
Additional
ns1.scs-ns.org. 5 A 138.190.34.196
ns2.scs-ns.org. 5 A 138.190.34.204
ns3.scs-ns.org. 5 A 193.222.76.54
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0