Apex domains cannot have CNAME records.
Question and response
Question
dig japa-maintenance.com. NS
Answer
japa-maintenance.com. 5 NS ns-989.awsdns-59.net.
japa-maintenance.com. 5 NS ns-2002.awsdns-58.co.uk.
japa-maintenance.com. 5 NS ns-389.awsdns-48.com.
japa-maintenance.com. 5 NS ns-397.awsdns-49.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0