You want to share your gameplay online if you’ve purchased a capture card recently. Still, if you are encountering audio issues, then you’ve found the appropriate resource for assistance.
If you’re a Windows user experiencing an issue where there’s no audio, here’s what you can do. Check if your microphone settings block access to all applications.

As Capture Cards rely on the microphone to send audio to your computer, you’ll need to turn on this feature. Navigate to the “Microphone Privacy Settings” and allow “Allow Apps to access your mic.” You need to grant access to each individual app separately. Once you’ve enabled this feature, it should work instantly.