Apex domains cannot have CNAME records.
Question and response
Question
dig concentrix.net. NS
Answer
concentrix.net. 4 NS odc-ns.cvgs.net.
concentrix.net. 4 NS cdc-ns.cvgs.net.
concentrix.net. 4 NS ams-ns.cvgs.net.
Authority
The response has no authority records.
Additional
ams-ns.cvgs.net. 4 A 193.104.192.200
cdc-ns.cvgs.net. 4 A 206.126.168.200
odc-ns.cvgs.net. 4 A 206.126.185.200
cdc-ns.cvgs.net. 4 AAAA 2620:103:90d2:3003:250:56ff:febb:60
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0