Find minimum group of array with difference less than k

I am working on code where I need to find the count of array group with difference between the elements of the array group should be less than k

Example
The numbers of awards per movie are awards = [1, 5, 4, 6, 8, 9, 2],
and the maximum allowed difference is k = 3.

• One way to divide the movies into the minimum number of groups is:
  The first group can contain [2, 1]. The maximum difference between
  awards of any two movies is 1 which does not exceed k.

• The second group can contain [5, 4, 6]. The maximum difference between awards of
  any two movies is 2 which does not exceed k

• The third group can
  contain [8, 9]. The maximum difference between awards of any two
  movies is 1 which does not exceed k. The movies can be divided into
  a minimum of 3 groups.

below is my code
But it is not working. What I am doinng wrong. Please help me.

function minimumGroups(nums, k) {
    // Write your code here
nums.sort((a,b) => (a - b))
    let result = 0
    for(let i = 0; i < nums.length; i++){
        if(i > 0 && nums[i] === nums[i - 1])
            continue
        for(let j = i + 1; j < nums.length; j++){
            let diff = nums[j] - nums[i]
            if(diff === k){
                result += 1
                break
            }
            if(diff > k) break
        }
    }
    return result
}