Google explains why the Pixel 6’s fingerprint scanner may be sluggish

While there are many things to love about the Google Pixel 6 Pro and 6 Pro, fingerprint scanners are not one of them. Users have complained about the slow and unreliable fingerprint scanner on the Pixel 6, which makes it difficult to unlock the phone. Google finally addressed those complaints. While it offered an explanation, it didn't offer a solid solution (via Engadget).
We are sorry. The Pixel 6 fingerprint sensor uses enhanced security algorithms. These enhanced security algorithms can sometimes take longer to verify, or require more direct contact with your sensor. Try troubleshooting steps: Thank you. Thank you.

Google replied to Twitter by pointing out that the problem was caused by the Pixel 6s fingerprint scanner's enhanced security algorithms. Google states that the security measures may make it take longer for your fingerprint to be verified or require more direct contact. The link then takes you to a Google support page. This doesn't really offer much assistance, other than advising to clean your fingers and to use a registered finger with your phone.

Other Twitter users have suggested that the problem may be hardware related. Some users believe that the Pixel 6's optical fingerprint scanner is slower than the Samsung Galaxy S21's ultrasonic, and this could explain the sensor's poor performance. Engadget noted that other Reddit users reported that the optical fingerprint scanner worked fine on their OnePlus phones. This could indicate a software problem specific to the Pixel 6.

It seems that there is no solution for the Pixel 6's finicky fingerprint scanner. Google's answer is at best vague. It is not clear if Google will be able to fix the problem with a software update or if the scanners enhanced security system really does care about prints. The Verge reached Google for comment, but did not receive a response.

You will have to use your PIN to enter your face unlock code until Google fixes its security flaws. The Pixel 6 will make you a test of patience as it tries to scan your fingerprint repeatedly.