Apex domains cannot have CNAME records.
Question and response
Question
dig tasc-engineering.com. NS
Answer
tasc-engineering.com. 5 NS ns-370.awsdns-46.com.
tasc-engineering.com. 5 NS ns-2035.awsdns-62.co.uk.
tasc-engineering.com. 5 NS ns-1911.awsdns-46.co.uk.
tasc-engineering.com. 5 NS ns-1362.awsdns-42.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0