Apex domains cannot have CNAME records.
Question and response
Question
dig becloud.by. NS
Answer
becloud.by. 5 NS ns2.g-cloud.by.
becloud.by. 5 NS ns6.becloudby.tech.
becloud.by. 5 NS ns1.g-cloud.by.
becloud.by. 5 NS ns5.becloudby.tech.
becloud.by. 5 NS ns3.g-cloud.by.
becloud.by. 5 NS ns4.becloudby.tech.
Authority
The response has no authority records.
Additional
ns1.g-cloud.by. 5 A 195.50.4.201
ns2.g-cloud.by. 5 A 185.11.78.243
ns3.g-cloud.by. 5 A 31.40.200.164
ns2.g-cloud.by. 5 AAAA 2a02:e300:0:21b:0:0:0:243
ns3.g-cloud.by. 5 AAAA 2a01:ba80:e:40:0:0:0:4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0