Apex domains cannot have CNAME records.
Question and response
Question
dig ax-msedge.net. NS
Answer
ax-msedge.net. 5 NS ns2.ax-msedge.net.
ax-msedge.net. 5 NS ns3.ax-msedge.net.
ax-msedge.net. 5 NS ns4.ax-msedge.net.
ax-msedge.net. 5 NS ns1.ax-msedge.net.
Authority
The response has no authority records.
Additional
ns1.ax-msedge.net. 5 A 150.171.27.1
ns2.ax-msedge.net. 5 A 150.171.27.2
ns3.ax-msedge.net. 5 A 150.171.28.1
ns4.ax-msedge.net. 5 A 150.171.28.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0