Apex domains cannot have CNAME records.
Question and response
Question
dig oahumopedrentals.com. NS
Answer
oahumopedrentals.com. 5 NS ns-345.awsdns-43.com.
oahumopedrentals.com. 5 NS ns-959.awsdns-55.net.
oahumopedrentals.com. 5 NS ns-2014.awsdns-59.co.uk.
oahumopedrentals.com. 5 NS ns-102.awsdns-12.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0