manager.clusters.ovh has no CNAME records.
Question and response
Question
dig manager.clusters.ovh. NS
Answer
The response has no answer records.
Authority
clusters.ovh. 3 SOA dns105.ovh.net. tech.ovh.net. 2026021300 86400 3600 3600000 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0