msappproxy.net has no TXT records.
Question and response
Question
dig msappproxy.net. TXT
Answer
The response has no answer records.
Authority
msappproxy.net. 60 SOA ns1-01.azure-dns.com. msnhst.microsoft.com. 10001 900 300 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0