Thinkpad X1 Extreme (1st gen) Fingerprint sensor problems

I have a 1st gen X1 extreme. I am currently working to get lenovo to replace a dead USB port before the warranty runs, which has been slowed thanks to covid (they can't come to houses, and shipping a laptop for a single dead USB port seems stupid).

In any event, I have had an intermittent issue with the fingerprint sensor on boot. On most cold boots recently, I cannot log into windows with a fingerprint. I am not getting a bad finger print error, it just acts like I didn't put my finger on it. Not light or anything from the scanner. I have to switch to password. Once I am logged in, the sensor works fine and on reboots, it seems to work fine, just cold boots are a problem. I'm leaning toward a software issue -- possible the new bios (1.29) I installed on 6/12, though I cannot recall if it started at the same time -- but if anyone has had something like this, and it was hardware, I'd love to get it fixed on the same trip.