Just something I have noticed when playing on the Xbox One. When you start a party or are the last to leave (only one in the party) there is a high pitched feedback that comes through the game and only the game. After unplugging the Mic, the noise persists and when the game and remain in the party, the noise stops.
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As it is in an Xbox Party it is the platforms issue, but if you get a similar issue in a fireteam then you can search for solutions on here.