[Sm-T715 MM] Cannot use fingerprint sensor to unlock anymore

Hi guys, i'm here to show you my problem. I've update to Marshmallow today and now i'm on Android 6.0.1, firmware version T715XXU2BPD6. Everything works just fine but i have a problem with the fingerprint sensor. In fact, with lollipop (5.0.2) i used it for unlocking my tablet, now it forces me to use a password, sign or PIN instead of using ONLY fingerprint (which was really fast and secure for me). Now i'm asking: Does anyone has the same problem? Can i still use ONLY fingerprint sensor (and so i'm an idiot because i'm not capable of solving this) even with the latest android version? I hope someone can help

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