If you have set the privacy setting to allow Orzone Remote Exam to access the camera but it is still not working, you may need to install Media Feature Pack for Windows.
Some versions of Windows do not come pre-installed with the Media Feature Pack for Windows. It can be downloaded from micrsoft here. Please make sure to download the version for your exact Windows version. The exact version of Windows can be seen in the Orzone Remote Exam device check.
Alternatively you can also install it directly from Windows if your version is Windows 10 (1903 or later):
For Windows 10 version 1903 and later, you can add the Media Feature Pack by going to Start > Settings > Apps > Apps and features > Optional features > Add a feature, and then locate Media Feature Pack in the list of available optional features.