Had the phone since about March. Had setup the fingerprint without a case. When the case was put on the phone finger wouldnt work anymore. Now it says fingerprint action cancelled without touching the screen.
What kind of case did you install? Is it with screen protector? If there is a screen protector then you have to make sure the screen protector is compatible with the ultrasocnic fingerprint scanner. If it is compatible, then please remove all fingerprints and add again. If you still have the issue, I'm afraid you may have to remove the screen protector because either the screen protector is not compatible or was installed wrong or is faulty. If nothing works, you should contact your samsung customer care.