A51 Sensor Controls

I don’t know, but recently I’ve noted that this galaxy camera can’t be manually sensor adjusted ISO and Exposure time. Well, in the camera built-in software, this is possible but not in API calls. Today, I call this methods to adjust manually the ISO and Exposure time regular Android Camera2 interface, say SENSOR_SENSITIVITY for ISO.
and [ SENSOR_EXPOSURE_TIME] (https://developer.android.com/reference/android/hardware/camera2/CaptureRequest#SENSOR_EXPOSURE_TIME) for Exposure.
But in this device (A51) does’t work. The image captured it’s very poor of brightness and very dark even with the values in maximum. I’ve missed something or it’s a bug on the firmware? In a S9 device works fine.