My iphone’s 6s touch id is not enabling. Every time i get “unable to complete touch id go back and try again”

See this for troubleshooting Touch ID. If Touch ID isn't working on your iPhone or iPad - Apple Support

Hi

Contact Support.apple.com They will test your touch I'd over your wifi.

They may make you an appointment at Apple store or authorised apple repairer.

Or they may send you a post paid box to return iPhone for repair.

Use simcard in other phone if you have one.

Cheers

Brian 🇬-1F1E7;