Apex domains cannot have CNAME records.
Question and response
Question
dig manulife-card.com. NS
Answer
manulife-card.com. 5 NS ns-331.awsdns-41.com.
manulife-card.com. 5 NS ns-930.awsdns-52.net.
manulife-card.com. 5 NS ns-682.awsdns-21.net.
manulife-card.com. 5 NS ns-515.awsdns-00.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0