There are few steps that you need to take to identify and solve the issue:
1. Check what audio you are trying to capture and include in the Studio. If it's only audio from one input device like a microphone, then check that the microphone is selected as the Audio Input option.
2. If the device is set to Default, the audio will only get picked up if your microphone is set to the default audio input device for their OS.
In Windows 10, that would be the System Sound settings:
Please also check the Advanced sound options to ensure that your browser is set to use the default, which would be what is select as the Input above:
These steps will ensure that the default device for audio input is your desired microphone.
3. Otherwise, it is often easier to manually select the specified microphone directly in Studio:
4. If you are trying to include audio from multiple sources, such as music from a media player or webpage as well as your microphone, you will need to use an audio mixer to combine the audio together and create a single input device that can be selected in Studio.
The same would apply if you would like to capture audio playing from your desktop without screen sharing and not include microphone audio. Windows had a built-in option for this called Stereo Mix, but with the update to Windows 10, this option is no longer available on many systems as an output option.
Instead, you would need to use audio mixing software such as VB-Audio Cable.
On macOS, there is the built-in Audio MIDI Setup for combining inputs and outputs.
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