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Try using Face ID without your sunglasses. If you're wearing sunglasses designed to block certain types of light, then your sunglasses might be blocking the infrared light used by the TrueDepth camera. If it is, you might see an alert at the top of the screen that says "Camera covered" with an arrow pointing at the TrueDepth camera. If you're using an iPad in landscape orientation, make sure that your finger or palm isn't covering the TrueDepth camera. Make sure that your iPhone or iPad is updated to the latest version of iOS. After each step, see if you still need help.
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