Body
Look in the upper-right corner of Chrome and click on the three dots/menu icon circled in the screenshot below.
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Select Settings.
Under Settings, click About Chrome.
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See if Chrome updates in the center screen where circled above.
If it updates, reboot your computer and try again.
If you continue to have issues with your microphone/camera in Collaborate after trying these steps, please feel free to reach out to the Tech Support group at 515-965-7300 to further troubleshoot the issue.