If you are looking to get message trace data the below Add-on has worked flawlessly for me, it hasn't broken once since I installed it. It allows you to collect message trace data without all the other stuff, so if you don't want AD/DNS you might look at this one.
https://splunkbase.splunk.com/app/3720/
From the docs you linked it looks like to me the App you are using is for "platform health and performance" which I wouldn't necessarily think includes message traces, but, it seems to explicitly state that it does "Track messages throughout your messaging environment" despite there being no configuration details for this.
Perhaps you could open a support ticket to get the docs updated either with instructions or to remove that point if it doesn't in fact support that functionality.
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