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The camera is greyed means there is no available camera found. Based on it, we suggest you check if the default camera is added/choose by referring the steps below (Click on the avatar>Settings>Devices>Camera).]
Besides, you can also check the Camera settings in PC by the steps (Open Windows Settings>Privacy>Camera). Meanwhile, to narrow down the issue, kindly use other apps or devices to check if this camera is available at your convenience.
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