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    [5, 3, 4,  6, 7, 8,  9, 1, 2],
    [6, 7, 2,  1, 9, 5,  3, 4, 8],
    [1, 9, 8,  3, 4, 2,  5, 6, 7],
    
    [8, 5, 9,  7, 6, 1,  4, 2, 3],
    [4, 2, 6,  8, 5, 3,  7, 9, 1],
    [7, 1, 3,  9, 2, 4,  8, 5, 6],
    
    [9, 6, 1,  5, 3, 7,  2, 8, 4],
    [2, 8, 7,  4, 1, 9,  6, 3, 5],
    [3, 4, 5,  2, 8, 6,  1, 7, 9]
    

    Those are the 9 sub-squares, the one you picked isn't one of them.

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    Please follow the link to Wikipedia to see an example of sudoku board and what a valid "sub grid" is. Not every 3x3 square of the board is a subgrid where the rules apply, there's only 9 of them.