Apex domains cannot have CNAME records.
Question and response
Question
dig mcm-tech.com. NS
Answer
mcm-tech.com. 5 NS ns-412.awsdns-51.com.
mcm-tech.com. 5 NS ns-1137.awsdns-14.org.
mcm-tech.com. 5 NS ns-17.awsdns-02.com.
mcm-tech.com. 5 NS ns-1041.awsdns-02.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0