1. First of all, the software version has not been updated. After the system pushed the latest version, the identification device was not updated in time, data could not be uploaded, and identification could not be performed.

2. Secondly, insufficient light will cause face recognition to fail. If the environment is dark, the device cannot recognize faces, and the device cannot recognize faces for a long time, resulting in face recognition failure. It can be solved under sufficient light conditions.

3. Finally, network conditions prevent face recognition. If the recognition device is not connected to the network or the network environment is too poor, the device cannot input data and the upload is interrupted, and the next step of instructions cannot be executed. Eventually, face recognition will fail.