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