Camera lens calibration creates no numeric value change

i have a new camera kit from Geeks at large on a xtool D1pro and new Lightburn paid version. When trying to get the camera lens calibrated the score value never changes as i suppose the grid card) is not seen. I haved moved it, changed background, changed lighting moved it sideways etc… The value never changes after an image capture. Thanks for any advice!!
old guy! be easy . )