Apex domains cannot have CNAME records.
Question and response
Question
dig talentera.com. NS
Answer
talentera.com. 5 NS ns-814.awsdns-37.net.
talentera.com. 5 NS ns-1835.awsdns-37.co.uk.
talentera.com. 5 NS ns-218.awsdns-27.com.
talentera.com. 5 NS ns-1356.awsdns-41.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0