Windows hello unable to detect camera

[OH EE EN]

I am using a Lenovo Yoga Slim 7i. I set up windows hello using facial recognition and was working fine, but recently it says that it is unable to detect a camera. I have tried switching on the camera app alone and it works but does not open when I try to re-setup facial recognition (it keeps saying no camera detected). I have also tried to run troubleshoot on the camera app but it said nothing was wrong? please help :")

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