Apex domains cannot have CNAME records.
Question and response
Question
dig l-msedge.net. NS
Answer
l-msedge.net. 5 NS ns1.l-msedge.net.
l-msedge.net. 5 NS ns2.l-msedge.net.
Authority
The response has no authority records.
Additional
ns1.l-msedge.net. 5 A 13.107.42.1
ns2.l-msedge.net. 5 A 13.107.42.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0