Apex domains cannot have CNAME records.
Question and response
Question
dig pivo.com. NS
Answer
pivo.com. 5 NS ns2.pivo.com.
pivo.com. 5 NS ns0.pivo.com.
pivo.com. 5 NS ns3.pivo.com.
pivo.com. 5 NS ns4.pivo.com.
pivo.com. 5 NS ns5.pivo.com.
pivo.com. 5 NS ns6.pivo.com.
pivo.com. 5 NS ns1.pivo.com.
Authority
The response has no authority records.
Additional
ns0.pivo.com. 5 A 142.202.188.19
ns1.pivo.com. 5 A 162.216.242.2
ns2.pivo.com. 5 A 108.181.13.234
ns3.pivo.com. 5 A 162.251.164.146
ns4.pivo.com. 5 A 108.181.159.122
ns5.pivo.com. 5 A 216.105.169.98
ns6.pivo.com. 5 A 173.0.55.138
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0