Touch ID

hey HelenCot,

this is a good resource. If Touch ID isn't working on your iPhone or iPad - Apple Support

the battery approach is an interesting one and i would say its considerable but i would follow the resource above. it sounds like you might need to get in contact with apple support and schedule a visit for hardware inspection

hope all goes well

Helen ~ 80% or less is considered to be unhealthy. So your 75% indicates a weak battery due to normal use and age. A weak battery can negatively affect an iPhone in a variety of ways, including Touch ID.

...Have the battery replaced and all will (probably) be well:

iPhone Battery & Power Repair

About genuine iPhone batteries

Repair Provider Verification

(Articles found by searching Apple's Knowledge Base.)

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Helen ~ Does your iPhone 8 still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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You're welcome Helen.

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