I also had trouble with the fingerprint calibration link provided by iFixit. The Google tool link they provided kept griping about the software on my phone being too new and it wouldn't proceed. In fact, it was encouraging me to reset my phone to an older release!
I found a Reddit thread with a set of instructions for a Pixel 6 that worked great: [link|https://www.reddit.com/r/Pixel6/comments/xbo8g4/how_i_fixed_my_fingerprint_reader_after_screen/|https://www.reddit.com/r/Pixel6/comments/xbo8g4/how_i_fixed_my_fingerprint_reader_after_screen/|new_window=true]. The key to this process working was the link in this step:
* Go to the "Fingerprint Calibration Software" tool on the "Google Pixel Update and Software Repair" site. [link|https://pixelrepair.withgoogle.com/udfps|https://pixelrepair.withgoogle.com/udfps|new_window=true] and do steps 1 (turn off phone), 2 (use Volume Down and Power button to enter fast boot) and 3 (plug phone into computer, click "Connect Phone" on web page).
Note I also enabled USB Debugging mode in Developer Options.
Hope this helps someone!