How do I add a FaceID with Mask? (Even with update my iPhone asks me to take my mask off)

Make sure that nothing is covering your face

Make sure that your eyes, nose, and mouth are fully visible to the TrueDepth camera. Face ID doesn't work if anything is covering your mouth and nose, like a face mask. If you're wearing a face mask, you'll be asked to enter your passcode automatically after swiping up.

Face ID works with many 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. Try using Face ID without your sunglasses.

If Face ID isn't working on your iPhone or iPad Pro - Apple ...

You may use this Apple Article which gives you all options not with mask, of course --> Set up Face ID on iPhone - Apple Support