If Blindsight is operating but cannot see due to insufficient light or mud on the sensor, the operator display will notify the operator, and a sensor vision obstructed event will be logged.
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Blindsight cannot generate detections from a sensor with insufficient vision.

Machine's operating at night, or underground in low light areas will likely generate sensor vision obstructed events.

Check the devices sensor live feed for mud, dirt or anything that would block the sensor's vision.
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If the device is not online, check the most recent detection videos generated by this device to see if any of the sensors are obstructed by anything.

Confirm what time the event was logged, and if there would have been sufficient lighting at that time.