Google recently published update of Android system for some phones including Pixel and some of Nexus devices. Many people thought that newest update doesn't have big mistakes, but as it turns out, users have noticed one mistake which makes using of phone uncomfortable.
After updating Android to 7.1.2 version on these phones it's impossible to use the fingerprint reader. Problem exists because system doesn't grant access for the fingerprint scanner. In spite of this, it has been noted that gesture detection on the phone continues to work. Some users even decided to do a hard reset of the phone, but it didn't help. For now problem has been detected on Pixel, Pixel XL, Nexus 5X and Nexus 6P. Google so far hasn't taken a stand on this issue.