Apex domains cannot have CNAME records.
Question and response
Question
dig wm-apps.com. NS
Answer
wm-apps.com. 5 NS ns-461.awsdns-57.com.
wm-apps.com. 5 NS ns-1409.awsdns-48.org.
wm-apps.com. 5 NS ns-582.awsdns-08.net.
wm-apps.com. 5 NS ns-1899.awsdns-45.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0