Javascript's initial code:

function createPhoneNumber(numbers){
  
}

The function is createPhoneNumber and its argument is numbers. If you do something like this:

function createPhoneNumber(numbers){
  return "(123) 456-7890";  // numbers is not used in the function's code
}

It doesn't matter if you call your function like this: createPhoneNumber([1, 1, 1, 1, 1, 1, 1, 1, 1, 1]) the answer will be "(123) 456-7890" instead of "(111) 111-1111". And that's what's wrong with your code.

There is no issue with the tests, your code isn't using the function's argument, so, no matter which value you call your function with, the answer will be the same.