Clean it. A lot.
Wipe the TouchID sensor. Wipe it really well, and do it often. Every time I clean off the sensor with my shirt tail, it works beautifully. Every time. It works perfectly. I don't know if my fingers are just more oily than the average person's or what, but I basically have to clean my TouchID every day. It's annoying and I hope Apple will account for this in future versions of the iPhone, but for now.... carry a cleaning cloth, or just wipe it off with your shirt. It is scratch-proof sapphire, after all.
David The Expert
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