dns2.CONVEX.RU has no TXT records.
Question and response
Question
dig dns2.CONVEX.RU. TXT
Answer
The response has no answer records.
Authority
CONVEX.RU. 3600 SOA dns.CONVEX.RU. root.CONVEX.RU. 2026030504 108002 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0