Apex domains cannot have CNAME records.
Question and response
Question
dig flaresubnet.com. NS
Answer
flaresubnet.com. 5 NS ns1.flaresubnet.com.
flaresubnet.com. 5 NS ns2.flaresubnet.com.
Authority
The response has no authority records.
Additional
ns1.flaresubnet.com. 5 A 150.107.200.13
ns2.flaresubnet.com. 5 A 150.107.200.208
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0