Touch ID setup
How do I setup a Touch ID on my iPhone 5s, anytime I try I get this feedback ( failed. Unable to complete Touch ID setup, go back and try again)
iPhone 5s
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See this support guide:--> If Touch ID isn't working on your iPhone or iPad - Apple Support
If you get no help, it could be a hadware problem at your Home Button. Make an appointment and have your device inspected at an Apple Store or AASP:--> Apple – Location Selector
Regards
Giulio