Latitude E6540 Fingerprint Touch Sensor not working

Hello Dell community, maybe you can help me with an issue I'm having with my laptop.

I got this 6540 a couple weeks ago, and I tired using the touch sensor with Windows Hello, but it wasn't noticing that I was using the sensor, the window never changed from "rest and lift your finger from the reader until setup is complete" so I thought the reader itself was faulty.

Luckily, the laptop itself is still under warranty, so I had a Dell tech come out and replace the palmrest. Still no dice.

I then followed this post for an E6520, still didn't work.

Does anyone else have this problem? Does anyone know how to solve this problem?

Things I have tried:

-Reinstalling the driver

-Updating the firmware

-Enabling TPM