Apex domains cannot have CNAME records.
Question and response
Question
dig mattertimeline.com. NS
Answer
mattertimeline.com. 4 NS ns-1319.awsdns-36.org.
mattertimeline.com. 4 NS ns-9.awsdns-01.com.
mattertimeline.com. 4 NS ns-928.awsdns-52.net.
mattertimeline.com. 4 NS ns-1843.awsdns-38.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0