Four in Four is the Key: Can you craft the key that would fit this Sudoku lock?

Today's Video:

Another fantastic puzzle from Will Power, glad I went back and checked it out!

Link to Play:

Four in Four is the Key by Will Power https://tinyurl.com/SudokuSleuth4in4isKey

Rules:

Normal Sudoku rules apply.

KILLER CAGES- Numbers in cages sum to the same number as all other cages.

ARROWS- Numbers on arrows sum to the number in the arrow's circle. Numbers may repeat on arrows, if other rules allow.

KROPKI PAIRS- Numbers with a white dot between them are consecutive. Numbers with a black dot between them are in a ratio of 2:1. Not all possible dots are given.