The Touch ID that was not working after iOS 8.3 update for App Store purchases seems to be back automatically for some, while a majority of users are still facing the issue.
"It has started working again. I haven't done anything else to troubleshoot so I'm guessing it was a server side issue as well," confirms a user at the Apple Support forum.
The annoying Touch ID issues abruptly cropped up soon after Apple made the new iOS 8 iteration available for compatible iPhone, iPad and iPod touch models last week, leaving the feature non-functional with the App Store purchases.
A member named giorgosathens, has shared an easy fix for those who are experiencing the issues. All you have to do is toggle iTunes & App Store. This resolution has worked for some users.
"I tried toggling "iTunes & Appstore" off and on first thing yesterday, but I didn't reboot and still didn't work. I tried the steps and rebooted and it seems to have fixed the iTouch problem with the appstore. So I had to reboot here it seems," asserts a user.
How to fix Touch ID not working after iOS 8.3 update for App Store purchases
Step-1: Launch Settings on your iOS 8.3 running iPhone or iPad
Step-2: Tap on Touch ID & Passcode
Step-3: Enter your Passcode or Password
Step-4: Toggle iTunes & App Store to OFF
Step-5: Press Home button to return to the Home screen
Step-6: Reboot your iPhone or iPad
Step-7: Enter your Passcode or Password on the Lock screen
Step-8: Again launch Settings on iPhone or iPad
Step-9: Tap on Touch ID & Passcode
Step-10: Enter your Passcode or Password
Step-11: Toggle iTunes & App Store to ON
This should, hopefully, get the Touch ID authentication working again on App Store purchases. Check out the video below that shows the Touch ID working fine.
[Source: Apple Support]