Click the upward pointing ‘chevron’ to the right of the microphone icon.
Either click "test speaker and microphone" to be taken through a step-by-step check of your settings or click "audio settings" to be able to select the microphone and change settings directly.

Widget Connector

overlay	youtube
_template	com/atlassian/confluence/extra/widgetconnector/templates/youtube.vm
width	640px
url	https://lsewww.atlassianyoutube.net/wiki/spaces/ZOOM/pages/edit-v2/229769217#Zoom-audio-and-video-basics-videocom/watch?v=ugda61PyFIo
height	400px

Network and bandwidth limitations

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