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Select the ellipsis (...) next to your profile picture or initials in the upper right, select Settings and then choose Devices.
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Under Microphone, select a microphone from the list. Try it out by using Make a test call.
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Set your preferences:
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Turn Automatically adjust mic sensitivity on or off.
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Set the level of background Noise suppression.
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Turn High fidelity music mode on or off. When on, this also allows you to control echo cancellation.
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To troubleshoot mic problems, see My microphone isn't working in Teams.