Apex domains cannot have CNAME records.
Question and response
Question
dig mylifespire.org. NS
Answer
mylifespire.org. 5 NS ns-205.awsdns-25.com.
mylifespire.org. 5 NS ns-1246.awsdns-27.org.
mylifespire.org. 5 NS ns-1881.awsdns-43.co.uk.
mylifespire.org. 5 NS ns-1926.awsdns-48.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0