Thank you for using Apple Support Communities. It seems like you are having trouble setting up Touch ID on the iPhone. This article has steps that may be able to help.
If Touch ID isn't working on your iPhone or iPad
Take care.
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Newsroom Update
Apple and Google deliver support for unwanted tracking alerts in iOS and Android. Learn more >
Apple and Google deliver support for unwanted tracking alerts in iOS and Android. Learn more >
If Touch ID isn't working on your iPhone or iPad
Unable to complete Touch ID setup. Please go back and try again