When I upgraded to IOS 11 upon release, there was a known issue regarding TouchID that affected my iPhone 6, and I had to delete my saved fingerprints and re-scan my fingers to solve this.
However, it did give me a failed TouchID message when it failed. I would say try to re-scan your fingerprints first, if that doesn't work, there may be an issue with the print scanner in the home button, it could be worth replacing the home button.
Before commencing repairs or taking it to a repair service, make sure you take some basic steps such as cleaning the home button of dirt, grime, etc, and ensuring that both your finger and the button are dry.
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