I think we need a few more details, Please describe exactly what happens when you use the button.One month ago i noticed creak on my Touch id button
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My advice would be to take it to your nearest Apple store, It will still be under warranty, It sounds like a hardware problem in which case they will replace it....Let us know the outcome.even when I touch the button I hear the creaking. sound is like scratching when iron scraper glass.Not to be confused with a click.
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