Apex domains cannot have CNAME records.
Question and response
Question
dig poseidon.securepanel.net. NS
Answer
poseidon.securepanel.net. 5 NS phx.ns.securepanel.net.
poseidon.securepanel.net. 5 NS atl.ns.securepanel.net.
Authority
The response has no authority records.
Additional
atl.ns.securepanel.net. 5 A 216.189.150.101
atl.ns.securepanel.net. 5 AAAA 2602:ffc5:0:0:0:0:ffc5:341e
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0