Apex domains cannot have CNAME records.
Question and response
Question
dig infobip.com. NS
Answer
infobip.com. 3 NS ns-1008.awsdns-62.net.
infobip.com. 3 NS ns-500.awsdns-62.com.
infobip.com. 3 NS ns-1844.awsdns-38.co.uk.
infobip.com. 3 NS ns-1429.awsdns-50.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0