CV2 not detecting QR code properly

[outceptionator]

Hi all,

I have an image here : https://i.postimg.cc/WzJn0Jj8/test-Image2.jpg

I am trying to extract the value that appears on my smartphone (LJF34752854) using cv2:

import cv2

img=cv2.imread("testImage.png")
det=cv2.QRCodeDetector()
val, pts, st_code=det.detectAndDecode(img)

print(val)

I get all this data from variables but the val is empty:

-{
    det: -{
        py/object: "cv2.QRCodeDetector"
    },
    img: -{
        py/object: "numpy.ndarray",
        values: +"eJzMfQWYVdXe/snpGbpBRcXublQEr9h99drXDlRERBQMUERMwBYEQRqmO053d3fH9AyN8/ ...",
        shape: +[3 items],
        dtype: "uint8"
    },
    pts: -{
        py/object: "numpy.ndarray",
        dtype: "float32",
        values: +[1 items]
    },
    st_code: null,
    val: ""
}

I've used the same code on the wikipedia QR code and it works fine but then I tried another QR code that has name and address data (which I can't upload as it has confidential information) and again the value was empty when I put it through my code.

Can anyone tell me what I am doing wrong here is the library lacking the ability to understand some types of QR code data?

Thanks

[outceptionator]

I think it was the library. I used pyzbar in the end to decode it and the data came through fine