Apex domains cannot have CNAME records.
Question and response
Question
dig granverano.com. NS
Answer
granverano.com. 5 NS ns1.granverano.com.
granverano.com. 5 NS ns2.granverano.com.
Authority
The response has no authority records.
Additional
ns1.granverano.com. 5 A 157.254.12.74
ns2.granverano.com. 5 A 51.77.72.84
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0