Apex domains cannot have CNAME records.
Question and response
Question
dig videoconferenceregistry.com. NS
Answer
videoconferenceregistry.com. 5 NS ns-45.awsdns-05.com.
videoconferenceregistry.com. 5 NS ns-1141.awsdns-14.org.
videoconferenceregistry.com. 5 NS ns-474.awsdns-59.com.
videoconferenceregistry.com. 5 NS ns-1422.awsdns-49.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0