mail.teams-test.awk.jp has no CNAME records.
Question and response
Question
dig mail.teams-test.awk.jp. NS
Answer
The response has no answer records.
Authority
teams-test.awk.jp. 272 SOA ns.teams-test.awk.jp. it-cs.rakus.co.jp. 1679645866 14400 60 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0