I can't get authentication for the cups admin interface. Auth.log says

cupsd: pam_sss(cups:auth): Request to sssd failed. Permission denied

Strace shows

406593 connect(522, {sa_family=AF_UNIX, sun_path="/var/lib/sss/pipes/private/pam"}, 110) = -1 EACCES (Permission denied)

Cups is running as root I added a pem_exec to verify that it's really called pam as root.

This is ubuntu 24.04, cups is from ubuntu, and seems to be some variant of 2.0