this problem occur when Camera and Mic are blocked.
a. To unblocked
1. click the video icon that is placed at the right side.
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click always allow to access Camera and Mic.
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click Done to save changes.
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click dismiss then refresh the webpage.
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now you can try the mic and camera.
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2. Another method is click the lock icon behind the search bar.
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click Site settings.
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click clear data.
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select clear.
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then after that just refresh the webpage and start the meeting.
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