Hi no-eye-bear,
I try to search the information in the client log files. Unfortunately, there is no such message about who mute somebody in a conference.
In the Skype meeting, only presenter have the right to mute meeting participants, individually or as a group. The attendees can’t do this. So, you can narrow down the scope.
You can read the document to learn more about mute/unmute audio in Skype meeting:
https://support.office.com/en-us/article/mute-or-unmute-audio-in-a-lync-meeting-or-call-94f12302-dc95-44ba-8792-c43e115b3d26
Best Regards,
Sharon Zhao
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