Why won't my microphone work on viber? (iPhone)?

I tried to call a friend but my microphone didn't work. I could hear my friend perfectly fine but she couldn't hear me. Before I called me friend, I had these notification thing popped out but I accidentally pressed the don't allow button. What did I do and how do I fix this?

Check for updated mic drivers if there aren't any then, uninstall microphone drivers then reboot your machine it will automatically detect new hardware and install drivers. Try mic again should be up and running fine.

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