Apex domains cannot have CNAME records.
Question and response
Question
dig maxgrowgrow.com. NS
Answer
maxgrowgrow.com. 5 NS ns-250.awsdns-31.com.
maxgrowgrow.com. 5 NS ns-1463.awsdns-54.org.
maxgrowgrow.com. 5 NS ns-1532.awsdns-63.org.
maxgrowgrow.com. 5 NS ns-1552.awsdns-02.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0