If your microphone is not working correctly during a LockDown Browser session, the following steps may help resolve the problem:

1. First, reboot your computer. Once restarted, close down all other applications on your computer other than LockDown Browser. It's essential that you ensure that no applications that may use a microphone (such as Skype, Facetime, Google+ and various utilities that may come with the webcam) are running.

2. If the microphone is still not detected in the webcam check,  you might want to download LockDown Browser again and reinstall it. You can obtain the download link from your institution's help desk, or by opening a ticket with Respondus Support.

3. Turn your computer's volume up all the way, and make sure that your computer's operating system hasn't muted LockDown Browser.

4. Mac Mojave users should also ensure they've granted the necessary permissions for the camera and mic to be used by LockDown Browser. See this article.

5. Open LockDown Browser, log in to your institution's learning management system, and navigate to a course.  Then click on the "Help Center" icon in the upper toolbar.

6. Click on the button titled "Run Webcam Check."  If your camera and microphone are detected and work properly in this check, then they should also work in the pre-exam webcam check.

7. If you still don't hear your recording, then click "it's not working" and follow the steps in the troubleshooter.

8. If problems persist, we recommend you hook up an external microphone to your computer and try the above steps again. Most external USB webcams come with a built-in microphone, so using one of these is a good troubleshooting step.
A USB headset with built-in mic is also worth trying.

If these troubleshooting steps do not succeed, you may have to use another computer for your exams.