In order to take the test, you will need a working web camera and microphone.
If your camera or microphone are not installed properly, you will be unable to start the test.
Unsure if your camera and microphone are enabled? Please follow the instructions listed here.
NOTE: Some operating systems (macOS Mojave, for example) also require that you give permissions to your computer (and not just the browser). Here is a step-by-step guide to show how you can make sure this is working properly.