Pixel 9 pro struggles with my finger scan if it’s too dry. I guess washing hands removes the body naturally produced oil and that makes it harder to scan.

I have the P9p and have more issues with the (ultra sonic) sensor than I did with the (optical sensor) on the previous P8p.

I even compared both in hand before trading in the older phone and the P8p scanning was much better.

Though I have to mention; to improve the optical sensor reading I had to do 4 fingerprints with different brightness for each scan, and that what helped a lot.

Too bad I can’t do the same with the Ultrasonic sensor since it doesn’t care about the brightness on the screen.

I learned it from another poster. I did the brightness trick when when I setup my fingerprintes (you setup four finger prints with the same finger, but with each fingerprint setup you change the brightness by %25 step. you start with the lowest brightness [assume it’s 0%] to the highest [%100] with each setup).

Thanks to that trick, I had at least %80 unlock success rate with my previous pixel 8P Pro!

I upgraded to the P9 Pro with the ultrasonic sensor, and unfortunately it’s actually worse than the optical for me, and add to that brightness trick doesn’t work with it either since it uses a different tech…