Apex domains cannot have CNAME records.
Question and response
Question
dig crossflowcloud.com. NS
Answer
crossflowcloud.com. 4 NS dns3.wavify.com.
crossflowcloud.com. 4 NS dns2.wavify.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0