Apex domains cannot have CNAME records.
Question and response
Question
dig agreementexpress.net. NS
Answer
agreementexpress.net. 4 NS ns-1728.awsdns-24.co.uk.
agreementexpress.net. 4 NS ns-129.awsdns-16.com.
agreementexpress.net. 4 NS ns-691.awsdns-22.net.
agreementexpress.net. 4 NS ns-1463.awsdns-54.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0