I have the same problem...
My Fingerprint scanner is not working properly last 3 days.
I tested from my phone through *#0*# there are giving me same Fail massage you can see on picture.
How can resolve this issue please help me.
Do you have a screen protector on the phone? It is always possible that a screen protector could affect the performance of an in-screen fingerprint sensor.
I don't have a screen protector. I already tried everything (factory reset, wipe the cache partition, enable and disable the developer options) and nothing...
My finger sensor stop working with the may update, then from samsung members said it will be fix with the june update but nothing.
I deleted all the fingerprints and when I want to add a new one, my finger sensor only reads up to 19%, then a message comes out that I must place my whole finger on the sensor and nothing happens.