I can't unlock Notification Tracker. What can I do?

Try this

1. Use Use device PIN, pattern or password on the lock screen.
2. Check that your fingerprint or face is still set up in Android Settings.
3. Close the app completely and open it again.
4. If you can unlock the app, turn Enable App Protection off in General Settings and on again.

Good to know

After a failed authentication the app closes on purpose, for your security. Your data isn't deleted.