Apex domains cannot have CNAME records.
Question and response
Question
dig sendeo.com.tr. NS
Answer
sendeo.com.tr. 3 NS ns2-03.azure-dns.net.
sendeo.com.tr. 3 NS ns4-03.azure-dns.info.
sendeo.com.tr. 3 NS ns1-03.azure-dns.com.
sendeo.com.tr. 3 NS ns3-03.azure-dns.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0