Apex domains cannot have CNAME records.
Question and response
Question
dig alchemer.com. NS
Answer
alchemer.com. 5 NS ns-1676.awsdns-17.co.uk.
alchemer.com. 5 NS ns-973.awsdns-57.net.
alchemer.com. 5 NS ns-83.awsdns-10.com.
alchemer.com. 5 NS ns-1175.awsdns-18.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0