what's the type of your device and anyway if you have ceramic screen protector or anti spy screen protector y'll find it very hard to recognize your fingerprint so in case of the ceramic screen protector give it a try it might work i recommend a glass screen protector
Hello. I’m Amira, Samsung Moderator First of all, I feel sorry to hear that you have experienced the anomaly we thank you for asking your question Based on your inquiry regarding to the issue Test the sensor by # * #0 * Use and update the sensor In case of changing the screen color Please make to the device factory reset Settings - General Administration - Return - Factory data reset - Device reset - All clear Before switching to this step, please copy the phone data http://www.samsung.com/eg/support/smartswitch/ If the screen color is not changed during the test and the issue still after rest you can visit us in a nearest service center to help you to solve the issue And you can know nearst service center through the following link http://www.samsung.com/eg/support/servicelocation/ we hope the issue will be solved ASAP Thanks
