Apex domains cannot have CNAME records.
Question and response
Question
dig acrownplumbing.com. NS
Answer
acrownplumbing.com. 5 NS ns47.domaincontrol.com.
acrownplumbing.com. 5 NS ns48.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0