Apex domains cannot have CNAME records.
Question and response
Question
dig vincze.work. NS
Answer
vincze.work. 5 NS ns21-lxc14.vincze.work.
vincze.work. 5 NS ns20-vps15.vincze.work.
Authority
The response has no authority records.
Additional
ns20-vps15.vincze.work. 5 A 217.144.53.126
ns21-lxc14.vincze.work. 5 A 217.144.53.90
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0