Apex domains cannot have CNAME records.
Question and response
Question
dig techbriefsmediagroup.com. NS
Answer
techbriefsmediagroup.com. 5 NS ns-1546.awsdns-01.co.uk.
techbriefsmediagroup.com. 5 NS ns-986.awsdns-59.net.
techbriefsmediagroup.com. 5 NS ns-228.awsdns-28.com.
techbriefsmediagroup.com. 5 NS ns-1360.awsdns-42.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0