nsa.scaleway.com has no CNAME records.
Question and response
Question
dig nsa.scaleway.com. NS
Answer
The response has no answer records.
Authority
scaleway.com. 3023 SOA nsa.scaleway.com. hostmaster.scaleway.com. 2026021901 3600 300 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0