What is the reason Face ID is not working?

The reason Face ID may not be working can vary depending on the specific situation. It could be due to a software issue, where the device needs to be updated or restarted. Physical obstructions such as dirt, sweat, or makeup on the face or the TrueDepth camera can also affect its functionality. Additionally, changes in appearance, such as wearing glasses or growing a beard, may require reconfiguring Face ID. In rare cases, hardware malfunctions or damage to the TrueDepth camera system could be the cause.

Make sure that your face isn't blocked Make sure that your eyes, nose, and mouth are fully visible to the TrueDepth camera. By default, Face ID doesn't work if anything is covering your mouth and nose. If you're wearing a face mask and have already set up Face ID with a mask,* make sure that your eyes aren't blocked.