Skype Meetings automatically detects and selects the most compatible audio device for your meeting. If you want to change your audio device, go to Call controls > Devices and select the device you want.
You can also save your audio device preference for future meetings:
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Go to More options > Meeting options.
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On the General tab, make sure the Remember me on this computer box is checked.
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On the Audio tab, click or tap the current device to see other available devices.
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Choose the one you want and select OK.