No sound detected: Make sure your mic isn't muted — check the physical mute button on your headset and the system volume mixer. On macOS, go to System Settings > Sound > Input and verify the right device is selected.
Permission denied: Click the microphone icon in your browser's address bar and change the setting to "Allow." On macOS, also check System Settings > Privacy & Security > Microphone.
Very quiet input: Increase the input volume in your system's sound settings. If you're using a condenser mic, make sure phantom power is enabled on your audio interface.
Echoing or feedback: Use headphones while testing to prevent your speakers from feeding back into the microphone. Lower the speaker volume or move farther from the speakers.
Crackling or popping: Try a different USB port. USB hubs can cause audio issues — plug your mic directly into your computer. Update your audio drivers if the problem persists.