I have a problem scanning numbers in a csv file into a two dimension vector in c

Question

I have a csv file in this format

28,36,59,10,48,41,58,34,35,72
44,36,40,28,29,91,79,74,29,19
80,75,82,21,97,85,41,77,40,34
83,11,46,91,97,22,17,38,75,83
32,99,19,80,18,26,77,10,66,92
41,65,54,66,67,94,50,13,48,88
89,25,96,64,66,42,91,29,52,51
42,56,23,65,38,10,65,26,87,25
43,15,50,71,16,39,51,19,15,37
92,28,42,39,72,42,85,18,72,14

I am trying to read all that into a two dimension vector with fsanf() but it seems like the conditional structure I have used is returning an exit code, I thought I could take advantage of fscanf function to use to parse for numbers and add them to the array but my code has a problem, please help

Code

    FILE* matFile = fopen(argv[1], "r");
    if (matFile == NULL){
        puts("File does not exist");
        return 99;
    }
    char* p1;
    char* p2;
    int ROWS = strtol(argv[2], &p1, 10 );
    int COLS= strtol(argv[3], &p2, 10 );
    int (*matrix_array)[ROWS] = malloc(sizeof(int[ROWS][COLS]));
    //here is where I am tryin to use fscanf to capture the numbers with no success
     for(int i=0;i<ROWS;i++){
        for(int j=0;j<COLS;j++){
            if(fscanf(matFile,"%d",&matrix_array[i][j])!=1)
                return 99;
        }
    }
    

Wy is the fscanf returning false for the csv I just posted?