Apex domains cannot have CNAME records.
Question and response
Question
dig accessin.cloud. NS
Answer
accessin.cloud. 5 NS ns2.cortel.cloud.
accessin.cloud. 5 NS ns1.cortel.cloud.
Authority
The response has no authority records.
Additional
ns1.cortel.cloud. 5 A 94.127.93.69
ns2.cortel.cloud. 5 A 213.108.5.250
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0