Apex domains cannot have CNAME records.
Question and response
Question
dig yourdomainprovider.net. NS
Answer
yourdomainprovider.net. 5 NS ns1.yourdomainprovider.net.
yourdomainprovider.net. 5 NS ns3.yourdomainprovider.net.
yourdomainprovider.net. 5 NS ns2.yourdomainprovider.net.
Authority
The response has no authority records.
Additional
ns1.yourdomainprovider.net. 5 A 185.88.143.183
ns2.yourdomainprovider.net. 5 A 46.101.153.24
ns3.yourdomainprovider.net. 5 A 104.236.29.251
ns1.yourdomainprovider.net. 5 AAAA 2a00:c6c0:0:150:1:0:0:1
ns2.yourdomainprovider.net. 5 AAAA 2a03:b0c0:3:d0:0:0:124:5001
ns3.yourdomainprovider.net. 5 AAAA 2604:a880:800:10:0:0:9a1:2001
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0