Apex domains cannot have CNAME records.
Question and response
Question
dig ci-commerce.com. NS
Answer
ci-commerce.com. 5 NS ns2.wpci-hosting.de.
ci-commerce.com. 5 NS ns3.wpci-hosting.de.
ci-commerce.com. 5 NS ns1.wpci-hosting.de.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0