Apex domains cannot have CNAME records.
Question and response
Question
dig tnasolutions.cl. NS
Answer
tnasolutions.cl. 5 NS ns2.worldwidedns.net.
tnasolutions.cl. 5 NS ns1.worldwidedns.net.
tnasolutions.cl. 5 NS ns3.worldwidedns.net.
Authority
The response has no authority records.
Additional
ns1.worldwidedns.net. 5 A 207.97.208.112
ns2.worldwidedns.net. 5 A 185.136.97.115
ns3.worldwidedns.net. 5 A 185.136.98.115
ns1.worldwidedns.net. 5 AAAA 2001:4802:7a61:501:2422:918:2689:75fc
ns2.worldwidedns.net. 5 AAAA 2a06:fb00:1:0:0:0:2:115
ns3.worldwidedns.net. 5 AAAA 2a06:fb00:1:0:0:0:3:115
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0