Apex domains cannot have CNAME records.
Question and response
Question
dig e8d.tw. NS
Answer
e8d.tw. 5 NS ns-1358.awsdns-41.org.
e8d.tw. 5 NS ns-444.awsdns-55.com.
e8d.tw. 5 NS ns-843.awsdns-41.net.
e8d.tw. 5 NS ns-1582.awsdns-05.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0