Apex domains cannot have CNAME records.
Question and response
Question
dig sailefoundation.com. NS
Answer
sailefoundation.com. 5 NS ns-433.awsdns-54.com.
sailefoundation.com. 5 NS ns-1707.awsdns-21.co.uk.
sailefoundation.com. 5 NS ns-389.awsdns-48.com.
sailefoundation.com. 5 NS ns-720.awsdns-26.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0