Apex domains cannot have CNAME records.
Question and response
Question
dig mysherwinwilliams.com. NS
Answer
mysherwinwilliams.com. 5 NS ns-1990.awsdns-56.co.uk.
mysherwinwilliams.com. 5 NS ns-1293.awsdns-33.org.
mysherwinwilliams.com. 5 NS ns-818.awsdns-38.net.
mysherwinwilliams.com. 5 NS ns-924.awsdns-51.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0