Apex domains cannot have CNAME records.
Question and response
Question
dig comfortel.pro. NS
Answer
comfortel.pro. 5 NS ns2.comfortel.pro.
comfortel.pro. 5 NS ns1.comfortel.pro.
Authority
The response has no authority records.
Additional
ns1.comfortel.pro. 5 A 85.143.162.254
ns2.comfortel.pro. 5 A 85.143.163.254
ns1.comfortel.pro. 5 AAAA 2a04:ac00:0:9:0:0:0:8888
ns2.comfortel.pro. 5 AAAA 2a04:ac00:0:9:0:0:0:8844
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0