app.syncedtool.com has no CNAME records.
Question and response
Question
dig app.syncedtool.com. NS
Answer
The response has no answer records.
Authority
syncedtool.com. 5536 SOA ns1.efscloud.net. root.efscloud.net. 56 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0