So basically I have a simliar problem as described here: https://bbs.archlinux.org/viewtopic.php?pid=2144463#p2144463
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I found that /etc/pam.d/polkit-1 was renamed to /etc/pam.d/polkit-1.pacsave.
I did not see any news entry about this breaking change.
Where do I configure PAM for polkit now?
I used to have the line
auth sufficient pam_u2f.so cue origin=pam://endeavour appid=pam://endeavou
in /etc/pam.d/polkit-1 in order for my YubiKey to be able to be used instead of my sudo password.
Since some days ago the file got renamed to /etc/pam.d/polkit-1.pacsave and it’s functionality obviously got lost.
EDIT: I think you are just supposed to rename /etc/pam.d/polkit-1.pacsave to /etc/pam.d/polkit-1 again. There is not a “new location” or something like that.