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Microsoft confirms Windows Hello no longer works in the dark
A recent Windows update has changed how Windows Hello face unlock works, now requiring a color camera in addition to IR sensors to authenticate you. That means it can no longer see you in low-light environments.
This is why Windows Hello has suddenly stopped working for users in many low-light situations, as it now requires a face to be visible via your webcam in addition to the 3D scan with IR sensors. Up until a couple of months ago, Windows Hello on my Surface Laptop 7 was able to authenticate me in the dark with no problems, but as of April 8, it stopped, requiring me to turn on a light or brighten my screen so that the camera could first see my face. Microsoft says this change was made to fix a spoofing vulnerability in Windows Hello, meaning that although it no longer works in the dark, it should now be more secure as a result.
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