Apex domains cannot have CNAME records.
Question and response
Question
dig 0566433773.com. NS
Answer
0566433773.com. 5 NS ns-57.awsdns-07.com.
0566433773.com. 5 NS ns-235.awsdns-29.com.
0566433773.com. 5 NS ns-75.awsdns-09.com.
0566433773.com. 5 NS ns-1122.awsdns-12.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0