Google Duo Not Working – Possible Fixes. Fix 1: Start Duo App Again. When you face Duo not working issue, then close the Google Duo app. You should even close the minimize screen. Now, re-open the Duo video calling app to make video calls. Fix 2: Check your Internet Connection. One most widely faced Google Duo not working issue is caused by
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"Unable to access microphone, please check system settings May 30, 2020 How to Fix Microphone Not Working Issue in Windows 10