Apex domains cannot have CNAME records.
Question and response
Question
dig web.az. NS
Answer
web.az. 5 NS ns3.host.az.
web.az. 5 NS ns2.host.az.
web.az. 5 NS ns1.host.az.
Authority
The response has no authority records.
Additional
ns1.host.az. 5 A 217.14.96.114
ns2.host.az. 5 A 217.14.96.34
ns3.host.az. 5 A 148.251.2.239
ns1.host.az. 5 AAAA 2a00:7da0:0:0:100:0:0:2
ns2.host.az. 5 AAAA 2a00:7da0:0:0:0:0:0:21
ns3.host.az. 5 AAAA 2a01:4f8:201:52f3:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0