Apex domains cannot have CNAME records.
Question and response
Question
dig c924e6e.dnsi3d.com. NS
Answer
c924e6e.dnsi3d.com. 5 NS suspension1.mydomainprovider.com.
c924e6e.dnsi3d.com. 5 NS suspension2.mydomainprovider.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0