Nobody else complained about it not working and the warning you had, which other amd64 users didn't have, seems to indicate that your pam configuration is not the standard one, maybe it's due to something you installed or configured?
Nobody else complained about it not working and the warning you had, which other amd64 users didn't have, seems to indicate that your pam configuration is not the standard one, maybe it's due to something you installed or configured?