I know this is old, but I think I found a way to get rid of the battery drain. Somewhere here someone suggested to jailbreak the phone and then disable the touchid service, but that was not an option for me so this is what I did:
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- I factory reset my phone and configure it as a new phone.
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- I factory restored my phone and configure it as a new phone.
- When it asked me to configure the touchid, I skipped the step.
After that, I stopped getting the Unable to activate touchid message and the battery is back to normal.
I know this is old, but I think I found a way to get rid of the battery drain. Somewhere here someone suggested to jailbreak the phone and then disable the touchid service, but that was not an option for me so this is what I did:
- I factory reset my phone and configure it as a new phone.
- When it asked me to configure the touchid, I skipped the step.
After that, I stopped getting the Unable to activate touchid message and the battery is back to normal.