Apex domains cannot have CNAME records.
Question and response
Question
dig workcloud.tech. NS
Answer
workcloud.tech. 5 NS ophelia.ns.cloudflare.com.
workcloud.tech. 5 NS jaime.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0