Apex domains cannot have CNAME records.
Question and response
Question
dig com.ni. NS
Answer
com.ni. 5 NS dns-ext.nic.cr.
com.ni. 5 NS ns2.ni.
com.ni. 5 NS ns.ideay.net.ni.
com.ni. 5 NS ns.ni.
com.ni. 5 NS ns3.ni.
Authority
The response has no authority records.
Additional
ns.ni. 172619 A 165.98.1.2
ns.ideay.net.NI. 172619 A 186.1.31.8
ns2.NI. 172619 A 200.9.187.2
ns3.ni. 172619 A 200.119.166.36
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0