Apex domains cannot have CNAME records.
Question and response
Question
dig me-dcc-doha-1.ocs.oraclecloud21.com. NS
Answer
me-dcc-doha-1.ocs.oraclecloud21.com. 5 NS ns2.p200.dns.me-dcc-doha-1.oci.oraclerealm21.com.
me-dcc-doha-1.ocs.oraclecloud21.com. 5 NS ns1.p200.dns.me-dcc-doha-1.oci.oraclerealm21.com.
me-dcc-doha-1.ocs.oraclecloud21.com. 5 NS ns3.p200.dns.me-dcc-doha-1.oci.oraclerealm21.com.
Authority
The response has no authority records.
Additional
ns1.p200.dns.me-dcc-doha-1.oci.oraclerealm21.com. 5 A 213.35.86.86
ns2.p200.dns.me-dcc-doha-1.oci.oraclerealm21.com. 5 A 213.35.82.21
ns3.p200.dns.me-dcc-doha-1.oci.oraclerealm21.com. 5 A 213.35.86.149
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0