jumpserver.yottavdi.com has no CNAME records.
Question and response
Question
dig jumpserver.yottavdi.com. NS
Answer
The response has no answer records.
Authority
yottavdi.com. 10800 SOA ns1.yotta.com. root\@ns1.yotta.com. 2025122302 3600 1800 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0