Apex domains cannot have CNAME records.
Question and response
Question
dig vzbi.com. NS
Answer
vzbi.com. 5 NS auth01.ns.uu.net.
vzbi.com. 5 NS auth-ns1.verizonbusiness.com.
vzbi.com. 5 NS auth50.ns.uu.net.
vzbi.com. 5 NS PDCDNS.vzbi.com.
vzbi.com. 5 NS OMZDNS.vzbi.com.
vzbi.com. 5 NS auth61.ns.uu.net.
vzbi.com. 5 NS NDCDNS.vzbi.com.
vzbi.com. 5 NS auth-ns2.verizonbusiness.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0