This post contains complete directions that help fix error code 0xA00F4246 while trying to launch the Webcam device in your Windows 10 or Windows Phone.
For Windows 10: Method 1: run the Hardware and Devices troubleshooter Method 2: update the Camera driver for your Integrated webcam from Device Manager Restart when ready.
Method 3: Run Integrated webcam driver (setup file) in compatibility mode. You may refer to the below post@ www.dell.com/support/article/us/en/4/SLN85507#W103 Take running ccsetup525 as an example... Tip: select Windows 8/8.1 operating system. Method 4: Uninstall -> restart > reinstall the webcam and audio drivers