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When I lock my phone using the POWER BUTTON, I can unlock it using fingerprint.

But when I use an APP to lock my phone (like WTN or Lock Screen etc.), I can only use a PIN or Password to unlock.

I see that finger print unlock is not supported in any 3rd party screen lock widgets/apps. Why is that? What makes the "Screen Off" initiated by the power button different from the "Screen Off" initiated by an app or widget?

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    Looks like locking without disabling finger-print unlocking is a new feature of Android 9 and it requires to use a special function to lock the screen: xda-developers.com/android-p-action-lock-screen Looks like the apps you use have not updated their app to use this new function. – Robert Mar 21 at 19:46
  • There is no reason they can't. There are many apps that uses fingerprint reader for app-specific locking (usually banking apps). Probably the main reason is there is not much demand for third party fingerprint lock screen, because you almost never see your lock screen when you use fingerprint unlock. Fingerprint unlock essentially bypasses the lock screen. With unlocking becoming so fast and easy when using fingerprint, there's also little need for lock screens widgets, you'd simply just touch and check your notifications or home screen. – Lie Ryan Mar 21 at 23:07
  • @Robert your guess is right. The link in your comment describes exactly what's happening when I use lock screen apps and why its happening. Very useful. Thanks Robert. So looks like all these apps are not up-to-date with the Accessibility Service related changes in Android 9.0. – sharpo Mar 22 at 6:20

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