Apex domains cannot have CNAME records.
Question and response
Question
dig talentlms.com. NS
Answer
talentlms.com. 5 NS ns-1460.awsdns-54.org.
talentlms.com. 5 NS ns-524.awsdns-01.net.
talentlms.com. 5 NS ns-445.awsdns-55.com.
talentlms.com. 5 NS ns-1876.awsdns-42.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0