Apex domains cannot have CNAME records.
Question and response
Question
dig transmmsac.com. NS
Answer
transmmsac.com. 4 NS ns-1186.awsdns-20.org.
transmmsac.com. 4 NS ns-1253.awsdns-28.org.
transmmsac.com. 4 NS ns-1943.awsdns-50.co.uk.
transmmsac.com. 4 NS ns-283.awsdns-35.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0