This is the prompt that is playing if the user is correct. [AvSubMsgCountENU172]. Please check the event viewer for this in a avconv error, warning or information. You should be able to reproduce this just by having the user check his/her messages. Refresh the event viewer and you should be able to find it.
This might give us a clue as to why it is getting played.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...