Apex domains cannot have CNAME records.
Question and response
Question
dig solidariteup.org. NS
Answer
solidariteup.org. 5 NS ns-77.awsdns-09.com.
solidariteup.org. 5 NS ns-2029.awsdns-61.co.uk.
solidariteup.org. 5 NS ns-1263.awsdns-29.org.
solidariteup.org. 5 NS ns-400.awsdns-50.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0