Apex domains cannot have CNAME records.
Question and response
Question
dig megalink.cloud. NS
Answer
megalink.cloud. 5 NS NS5.MegaLink.com.
megalink.cloud. 5 NS ns4.megalink.com.
megalink.cloud. 5 NS ns3.megalink.com.
megalink.cloud. 5 NS ns6.megalink.com.
megalink.cloud. 5 NS ns2.megalink.com.
Authority
The response has no authority records.
Additional
ns2.MegaLink.com. 5 A 200.75.160.20
ns3.megalink.com. 5 A 23.152.224.15
ns4.MegaLink.com. 5 A 85.234.130.30
ns5.MegaLink.com. 5 A 88.99.13.51
ns6.MegaLink.com. 5 A 38.7.201.134
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0