Apex domains cannot have CNAME records.
Question and response
Question
dig ulworkplace.com. NS
Answer
ulworkplace.com. 4 NS ns-477.awsdns-59.com.
ulworkplace.com. 4 NS ns-971.awsdns-57.net.
ulworkplace.com. 4 NS ns-1116.awsdns-11.org.
ulworkplace.com. 4 NS ns-1979.awsdns-55.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0