Fingerprint Sensor not working

Hi all, so I have a Samsung Galaxy S9+ that has had an inoperable fingerprint sensor for some time. I got the iOpener kit and a new fingerprint sensor from iFixit to fix this. However after installing the new one I got a message saying the sensor wasn't working. The flex cable is securely attached into the fingerprint sensor port. So iFixit sent me a new sensor, thinking it was a bad sensor. However the replacment recently arrived and this is won't register either. I keep getting the message "fingerprint sensor not working". I've restarted the phone, booted into recovery mode and cleared the system cache in case anything funky was happening. No dice. Has anyone encountered this error while replacing the sensor? The guide on iFixit makes it look like just plug in the one and you're good to go. Thanks for the help!