First try to fix “Microphone blocked” or “Camera blocked” in your browser
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If that doesn’t work, try updating your Apple/Mac system settings or your Windows system settings

In the upper-left corner of the setup window, click View Site Information icon
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Make sure microphone and/or camera are enabled (depending on which device you're having issues with)
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Click outside the "Site Information" window to continue
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Select a camera or microphone in the setup window and follow the prompts to continue setup
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Mouse to the upper left-hand corner of your screen and click the Apple icon to open System Settings

In the search field, type “microphone” or “camera”
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Select “Allow applications to access …” in the left-hand panel
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In the right-hand panel, click the toggle next to Google Chrome, Microsoft Edge, or Brave (whichever browser you are using) to 'on’

Follow the instructions to Quit & Reopen

Re-follow the link already shared with you
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You will need to go through some of the steps you completed earlier, but this time you should be able to select a microphone or camera

In the Start menu, open Settings

Search for “Microphone Privacy Settings” or “Camera Privacy Settings” and open it

Scroll to find “Allow desktop apps to access your …” microphone or camera
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Click the toggle to 'on'

Exit the browser
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Re-follow the link already shared with you
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You will need to go through some of the steps you completed earlier, but this time you should be able to select a microphone or camera