Solution for fingerprint issues with my Xperia Z5!
Here my Workaround:
I activate Sony Movie Creator again (software was deactivated since the Version Marshmallow)
and then i update to latest version in Google Play Store.
After reboot always works fine with Android Nougat 7.1.1
Now Fingerprinthardware works again and also menu entry appears in settings (display & security) !
🙂