Apex domains cannot have CNAME records.
Question and response
Question
dig emea.verizonbusiness.com. NS
Answer
emea.verizonbusiness.com. 5 NS auth200.ns.uu.net.
emea.verizonbusiness.com. 5 NS auth210.ns.uu.net.
emea.verizonbusiness.com. 5 NS ns.emea.verizonbusiness.com.
Authority
The response has no authority records.
Additional
ns.emea.verizonbusiness.com. 5 A 194.203.119.36
auth200.ns.uu.net. 5 A 195.129.12.82
auth210.ns.uu.net. 5 A 195.129.12.74
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0