Please kindly check if the camera is pointing at a glass window, a white wall, or any other smooth surface.

A smooth surface may reflect the infrared light, causing the camera to be unable to monitor in the dark.

You can try manually rotating the camera to see if the situation changes when it is pointed at different angles, or simply move the camera to another location to see if the issue can be resolved.

If the issue persists or if you still have questions, please contact customer support for further assistance.