To correct this, go into the settings for the Skype for Business app on your phone and make sure that it is allowed to use the microphone. Skype for Business may not have access to your phone's microphone. This is explained in detail later in this article. This will cause the mute button for all participants to be grayed out until the organizer unmutes the audience. The meeting organizer may have muted the audience. The mute button on your laptop or phone may be grayed out during a meeting, not allowing you to unmute yourself. What to do if your mute button is grayed out Note: When you call into a Skype for Business meeting by phone, your audio is on by default. When you want to speak, click the Mute button to unmute your microphone. Sometimes when you join a Skype for Business meeting, your microphone is muted by default. Mute or unmute your microphone in a Skype for Business meeting or call window See Set up and test Skype for Business audio for details and information about fixing Windows sound problems. Make sure your microphone is working correctly before joining a Skype for Business meeting or call and adjust volume levels and audio quality as needed. (If you're using Lync on your mobile phone, you can also mute and unmute from there.) You can do this either in the Skype for Business meeting window or on your phone if you call into the meeting.

When you're in a Skype for Business meeting or call, you might have to mute or unmute your microphone multiple times. Skype for Business Skype for Business Online Skype for Business Online operated by 21Vianet More.

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