Apex domains cannot have CNAME records.
Question and response
Question
dig uy. NS
Answer
uy. 5 NS ns.dns.br.
uy. 5 NS ns1.anteldata.com.uy.
uy. 5 NS d.nic.uy.
uy. 5 NS a.lactld.org.
uy. 5 NS b.nic.uy.
uy. 5 NS a.nic.uy.
uy. 5 NS ns2.anteldata.com.uy.
Authority
The response has no authority records.
Additional
a.lactld.org. 5 A 200.0.68.10
d.nic.uy. 155679 A 65.22.41.1
a.lactld.org. 5 AAAA 2801:14:a000:0:0:0:0:10
d.nic.uy. 155679 AAAA 2a01:8840:1bb:0:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0