I recently fix the sensor problem completely by using a different way to register my fingerprint in the settings. It is now working 99% of the time in one try.
What I do in the Settings:
Yes, it’s important to really take care when recording fingerprints. As many angles and parts of the fingertip as possible, and for each scan, maintain the touch until instructed to lift the finger.
Yeah, I think mine is broken as well. I never activated it two years ago, because I was used to use the code. But a few months back I noticed there is an option to use it to “wipe” so that the notifications come on screen. I activated that wipe thing, but it never worked.
That does not mean, that your sensor broke. Mine works perfectly fine for authentication, etc. But the option you mentioned does not work for me either.