sp-techdiff2.aa.sc.efscloud.net has no CNAME records.
Question and response
Question
dig sp-techdiff2.aa.sc.efscloud.net. NS
Answer
The response has no answer records.
Authority
aa.sc.efscloud.net. 535 SOA ns1.efscloud.net. root.efscloud.net. 1651246721 3600 900 3600000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0