Apex domains cannot have CNAME records.
Question and response
Question
dig titanhq.com. NS
Answer
titanhq.com. 5 NS ns-1227.awsdns-25.org.
titanhq.com. 5 NS ns-402.awsdns-50.com.
titanhq.com. 5 NS ns-1009.awsdns-62.net.
titanhq.com. 5 NS ns-1543.awsdns-00.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0