Apex domains cannot have CNAME records.
Question and response
Question
dig nextlayer.com. NS
Answer
nextlayer.com. 5 NS nsany1.nextlayer.com.
nextlayer.com. 5 NS nsany2.nextlayer.com.
Authority
The response has no authority records.
Additional
nsany1.nextlayer.com. 5 A 192.174.68.100
nsany2.nextlayer.com. 5 A 176.97.158.100
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0