Apex domains cannot have CNAME records.
Question and response
Question
dig vdx.network. NS
Answer
vdx.network. 5 NS ns4.vinehost.net.
vdx.network. 5 NS ns3.vinehost.net.
vdx.network. 5 NS ns0.vinehost.net.
vdx.network. 5 NS ns1.vinehost.net.
vdx.network. 5 NS ns2.vinehost.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0